Start the server but without a bundle containing a model validator which is already in the database. Normaly, you should not be able to log in due to the missing model validator. However, simply pressing refresh in the browser after the login try lets you use the webui. This can lead to inconsitency!
Patch fixes the bug BUT: the server will also forget the user/pass if your previously had the "remember me" checkbox activated. Not critical but also not nice for end users.
Start the server but without a bundle containing a model validator which is already in the database. Normaly, you should not be able to log in due to the missing model validator. However, simply pressing refresh in the browser after the login try lets you use the webui. This can lead to inconsitency!