Cannot create auto_update reference with deleted latest revision

[das-Abroxas]

Describe the bug

An object reference with auto_update == true can only be created on the latest revision of an object. If the objects' latest revision is already deleted via force you can't create an auto_update reference anymore without updating the object beforehand.

To Reproduce

Steps to reproduce the behavior:

1. Create an object with at least two revisions.
2. Create a auto_update == false reference on a revision which is not the latest
3. Delete the latest revision with force == true
4. Try to create a auto_update == true reference on the latest revision below the deleted

Expected behavior

The latest revision of an object should be the newest revision which is not already deleted.