diff --git a/.changeset/lazy-entry-rolldown-reclassify.md b/.changeset/lazy-entry-rolldown-reclassify.md
new file mode 100644
index 0000000..d6aa82d
--- /dev/null
+++ b/.changeset/lazy-entry-rolldown-reclassify.md
@@ -0,0 +1,5 @@
+---
+'vite-plugin-solid': patch
+---
+
+Reclassify emitted lazy facade chunks by assigning `isEntry = false` instead of deleting the property. Under rolldown-vite (Vite 8), bundle chunks in `generateBundle` are proxies whose set trap syncs assignments back to the native bundle, while a delete is swallowed by the proxy's read cache — so the reclassification silently no-oped and downstream plugins (e.g. TanStack Start's manifest plugin) still saw every lazy facade chunk as an application entry, failing builds with "multiple entries detected".
diff --git a/src/index.ts b/src/index.ts
index 31fa979..0aecc77 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -268,7 +268,7 @@ function normalizeEmittedLazyEntries(manifest: Record<string, any>) {
   for (const key of dynamicKeys) {
     const entry = manifest[key];
     if (entry && entry.isEntry) {
-      delete entry.isEntry;
+      entry.isEntry = false;
       entry.isDynamicEntry = true;
     }
   }