Can't fork a collection: Collection not found

When I try to fork a test collection, after 10 secondes Postman says Collection Not Found and a notification who says that the fork is created.
When I browse my collections, the fork is NOT created.

The collection I want to fork has more than 24 000 asserts.

It has been tested on Client on Windows and on Chrome.

The same issue also happens on Mac (MacOS 12.0.1 AppleM1) and in the Web Version.
Client Version is 9.1.5.

In my specific case I tried to fork the collection from “Zoho CRM Developers”.

Any ideas?