Hi,

When you go to "Managed Properties" on a Plug-in assembly, when you uncheck the "Allow customizations", and apply the change, an error occurs ; "An unexpected error occurred".

After contacting support, the answer is Allow customizations” managed property on plugin assembly was never supported.

Even in the classic editor (WebRefresh), if you try to do it you will get the same error.

There is a real interest in refusing customizations in production on assembly plug-ins

Regards

Jean-Pierre