Unable to save CMS block and CMS page in incognito mode on an instance with basic auth.

[zengang]

Preconditions (*)

1. Magento CE 2.4.1 with/without sample data, Magento CE 2.3.5-p1.
2. Enabled basic auth on the instance.
3. Log in to the admin panel into the incognito mode of the browser.

Steps to reproduce (*)

1. Log in to the admin panel into the incognito mode of the browser.
2. Open navigate to the edit page of the CMS block/page.
3. Change any value in the content.
4. Save the block/page.

Expected result (*)

1. The block/page is successfully saved.

Actual result (*)

1. Change is not saved. There are errors in the console.

Additional information

The issue caused by the 401 error during the loading js files. The loading is inited from the iframe with Page Builders configurations (magento/vendor/magento/module-page-builder/view/adminhtml/templates/stage/render.phtml).
There is no Authorization parameter at the head of the file request.

[m2-assistant]

Hi @zengang. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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