diff --git a/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.html b/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.html
index 43fdf7733e7..320819ab56d 100644
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.html
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.html
@@ -51,7 +51,7 @@
       [resultTemplate]="rt"
       [type]="model.inputType"
       [(ngModel)]="currentValue"
-      (blur)="onBlur($event)"
+      (blur)="onBlur($event, false)"
       (focus)="onFocus($event)"
       (change)="onChange($event)"
       (input)="onInput($event)"
@@ -79,6 +79,7 @@
       [disabled]="model.readOnly"
       [type]="model.inputType"
       [value]="currentValue?.display"
+      (blur)="onBlur($event, true)"
       (focus)="onFocus($event)"
       (change)="onChange($event)"
       (click)="openTree($event)"
diff --git a/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.spec.ts b/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.spec.ts
index bf2723eda54..96133aa3d9b 100644
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.spec.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.spec.ts
@@ -90,7 +90,7 @@ function init() {
   };
 }
 
-describe('DsDynamicOneboxComponent test suite', () => {
+describe('DsDynamicOneboxComponent', () => {
 
   let scheduler: TestScheduler;
   let testComp: TestComponent;
@@ -262,7 +262,9 @@ describe('DsDynamicOneboxComponent test suite', () => {
       it('should emit blur Event onBlur when popup is closed', () => {
         spyOn(oneboxComponent.blur, 'emit');
         spyOn(oneboxComponent.instance, 'isPopupOpen').and.returnValue(false);
-        oneboxComponent.onBlur(new Event('blur'));
+
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
         expect(oneboxComponent.blur.emit).toHaveBeenCalled();
       });
 
@@ -281,7 +283,9 @@ describe('DsDynamicOneboxComponent test suite', () => {
         spyOn(oneboxComponent.blur, 'emit');
         spyOn(oneboxComponent.change, 'emit');
         spyOn(oneboxComponent.instance, 'isPopupOpen').and.returnValue(false);
-        oneboxComponent.onBlur(new Event('blur'));
+
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
         expect(oneboxComponent.change.emit).toHaveBeenCalled();
         expect(oneboxComponent.blur.emit).toHaveBeenCalled();
       });
@@ -294,7 +298,9 @@ describe('DsDynamicOneboxComponent test suite', () => {
         spyOn(oneboxComponent.blur, 'emit');
         spyOn(oneboxComponent.change, 'emit');
         spyOn(oneboxComponent.instance, 'isPopupOpen').and.returnValue(false);
-        oneboxComponent.onBlur(new Event('blur'));
+
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
         expect(oneboxComponent.change.emit).not.toHaveBeenCalled();
         expect(oneboxComponent.blur.emit).toHaveBeenCalled();
       });
@@ -307,7 +313,9 @@ describe('DsDynamicOneboxComponent test suite', () => {
         spyOn(oneboxComponent.blur, 'emit');
         spyOn(oneboxComponent.change, 'emit');
         spyOn(oneboxComponent.instance, 'isPopupOpen').and.returnValue(false);
-        oneboxComponent.onBlur(new Event('blur'));
+
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
         expect(oneboxComponent.change.emit).not.toHaveBeenCalled();
         expect(oneboxComponent.blur.emit).toHaveBeenCalled();
       });
@@ -429,6 +437,29 @@ describe('DsDynamicOneboxComponent test suite', () => {
         expect((oneboxComponent as any).modalService.open).toHaveBeenCalled();
         done();
       });
+
+      it('should emit the blur event when the popup is closed', () => {
+        spyOn(oneboxComponent.blur, 'emit');
+
+        oneboxComponent.vocabularyTreeOpen = false;
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
+        expect(oneboxComponent.blur.emit).toHaveBeenCalled();
+      });
+
+      it('should not emit the blur event when the popup is open', fakeAsync(() => {
+        spyOn(oneboxComponent.blur, 'emit');
+        spyOn(oneboxComponent, 'onBlur').and.callThrough();
+
+        scheduler.schedule(() => oneboxComponent.openTree(new Event('click')));
+        scheduler.flush();
+        expect(oneboxComponent.vocabularyTreeOpen).toBeTrue();
+
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
+        expect(oneboxComponent.onBlur).toHaveBeenCalled();
+        expect(oneboxComponent.blur.emit).not.toHaveBeenCalled();
+      }));
     });
 
     describe('when init model value is not empty', () => {
@@ -464,6 +495,28 @@ describe('DsDynamicOneboxComponent test suite', () => {
         expect((oneboxComponent as any).modalService.open).toHaveBeenCalled();
         done();
       });
+
+      it('should emit the blur event when the popup is closed', () => {
+        spyOn(oneboxComponent.blur, 'emit');
+
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
+        expect(oneboxComponent.blur.emit).toHaveBeenCalled();
+      });
+
+      it('should not emit the blur event when the popup is open', fakeAsync(() => {
+        spyOn(oneboxComponent.blur, 'emit');
+        spyOn(oneboxComponent, 'onBlur').and.callThrough();
+
+        scheduler.schedule(() => oneboxComponent.openTree(new Event('click')));
+        scheduler.flush();
+        expect(oneboxComponent.vocabularyTreeOpen).toBeTrue();
+
+        oneboxCompFixture.debugElement.query(By.css('input')).triggerEventHandler('blur', new Event('blur'));
+
+        expect(oneboxComponent.onBlur).toHaveBeenCalled();
+        expect(oneboxComponent.blur.emit).not.toHaveBeenCalled();
+      }));
     });
 
   });
diff --git a/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.ts b/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.ts
index 5b2cfd01a8b..320f7402c4f 100644
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/models/onebox/dynamic-onebox.component.ts
@@ -112,6 +112,12 @@ export class DsDynamicOneboxComponent extends DsDynamicVocabularyComponent imple
   inputValue: any;
   preloadLevel: number;
 
+  /**
+   * Whether the controlled vocabulary tree popup modal is open. We use this to know whether the loss of focus was
+   * caused by opening the modal or if it was caused by the user.
+   */
+  vocabularyTreeOpen = false;
+
   private vocabulary$: Observable<Vocabulary>;
   private isHierarchicalVocabulary$: Observable<boolean>;
   private subs: Subscription[] = [];
@@ -230,26 +236,33 @@ export class DsDynamicOneboxComponent extends DsDynamicVocabularyComponent imple
   /**
    * Emits a blur event containing a given value.
    * @param event The value to emit.
+   * @param hierarchical Whether this event was emitted from a hierarchical vocabulary field
    */
-  onBlur(event: Event) {
-    if (!this.instance.isPopupOpen()) {
-      if (!this.model.vocabularyOptions.closed && isNotEmpty(this.inputValue)) {
-        if (isNotNull(this.inputValue) && this.model.value !== this.inputValue) {
-          this.dispatchUpdate(this.inputValue);
-        }
-        this.inputValue = null;
+  onBlur(event: Event, hierarchical: boolean = false): void {
+    if (hierarchical) {
+      if (!this.vocabularyTreeOpen) {
+        super.onBlur(event);
       }
-      this.blur.emit(event);
     } else {
-      // prevent on blur propagation if typeahed suggestions are showed
-      event.preventDefault();
-      event.stopImmediatePropagation();
-      // update the value with the searched text if the user hasn't selected any suggestion
-      if (!this.model.vocabularyOptions.closed && isNotEmpty(this.inputValue)) {
-        if (isNotNull(this.inputValue) && this.model.value !== this.inputValue) {
-          this.dispatchUpdate(this.inputValue);
+      if (!this.instance.isPopupOpen()) {
+        if (!this.model.vocabularyOptions.closed && isNotEmpty(this.inputValue)) {
+          if (isNotNull(this.inputValue) && this.model.value !== this.inputValue) {
+            this.dispatchUpdate(this.inputValue);
+          }
+          this.inputValue = null;
+        }
+        super.onBlur(event);
+      } else {
+        // prevent on blur propagation if typeahed suggestions are showed
+        event.preventDefault();
+        event.stopImmediatePropagation();
+        // update the value with the searched text if the user hasn't selected any suggestion
+        if (!this.model.vocabularyOptions.closed && isNotEmpty(this.inputValue)) {
+          if (isNotNull(this.inputValue) && this.model.value !== this.inputValue) {
+            this.dispatchUpdate(this.inputValue);
+          }
+          this.inputValue = null;
         }
-        this.inputValue = null;
       }
     }
   }
@@ -290,6 +303,7 @@ export class DsDynamicOneboxComponent extends DsDynamicVocabularyComponent imple
       take(1),
     ).subscribe((preloadLevel) => {
       const modalRef: NgbModalRef = this.modalService.open(VocabularyTreeviewModalComponent, { size: 'lg', windowClass: 'treeview' });
+      this.vocabularyTreeOpen = true;
       modalRef.componentInstance.vocabularyOptions = this.model.vocabularyOptions;
       modalRef.componentInstance.preloadLevel = preloadLevel;
       modalRef.componentInstance.selectedItems = this.currentValue ? [this.currentValue] : [];
@@ -298,8 +312,9 @@ export class DsDynamicOneboxComponent extends DsDynamicVocabularyComponent imple
           this.currentValue = result;
           this.dispatchUpdate(result);
         }
+        this.vocabularyTreeOpen = false;
       }, () => {
-        return;
+        this.vocabularyTreeOpen = false;
       });
     }));
   }
diff --git a/src/app/shared/form/vocabulary-treeview/vocabulary-treeview.component.html b/src/app/shared/form/vocabulary-treeview/vocabulary-treeview.component.html
index 1a35ed525c3..bdddc3d7cf9 100644
--- a/src/app/shared/form/vocabulary-treeview/vocabulary-treeview.component.html
+++ b/src/app/shared/form/vocabulary-treeview/vocabulary-treeview.component.html
@@ -74,7 +74,8 @@ <h2 class="h4 text-center text-muted mt-4" >
           container="body"
           (click)="onSelect(node.item)"
           role="button"
-          tabindex="0">
+          tabindex="0"
+          type="button">
           <span>{{node.item.display}}</span>
         </button>
       }
@@ -118,7 +119,8 @@ <h2 class="h4 text-center text-muted mt-4" >
           container="body"
           (click)="onSelect(node.item)"
           role="button"
-          tabindex="0">
+          tabindex="0"
+          type="button">
           <span>{{node.item.display}}</span>
         </button>
       }
@@ -126,14 +128,16 @@ <h2 class="h4 text-center text-muted mt-4" >
 
     <cdk-tree-node *cdkTreeNodeDef="let node; when: isLoadMore" cdkTreeNodePadding>
       <button class="btn btn-outline-secondary btn-sm" (click)="loadMore(node.loadMoreParentItem)"
-        [attr.aria-label]="'vocabulary-treeview.load-more' | translate" role="button" tabindex="0">
+              [attr.aria-label]="'vocabulary-treeview.load-more' | translate"
+              role="button" tabindex="0" type="button">
         {{'vocabulary-treeview.load-more' | translate}}...
       </button>
     </cdk-tree-node>
 
     <cdk-tree-node *cdkTreeNodeDef="let node; when: isLoadMoreRoot">
       <button class="btn btn-outline-secondary btn-sm" (click)="loadMoreRoot(node)"
-        [attr.aria-label]="'vocabulary-treeview.load-more' | translate" role="button" tabindex="0">
+              [attr.aria-label]="'vocabulary-treeview.load-more' | translate"
+              role="button" tabindex="0" type="button">
         {{'vocabulary-treeview.load-more' | translate}}...
       </button>
     </cdk-tree-node>