Bug#968971: gitlab: Can't create new project: undefined method `set_attribute_was'

Here I am running 13.2.8-1+fto10+2 on top of a Debian Buster, following the recommended "FastTrack" installation method. I get a similar error related to a missing "set_attribute_was" method when trying to add a new push mirror to an existing repository. The only mentions I found of this metho

Bug#968971: gitlab: Can't create new project: undefined method `set_attribute_was' for #

Package: gitlab Version: 13.2.6-1+fto10+1 Severity: important Tags: upstream Dear Maintainer, Since I upgraded from 12.2.9-1+fto10+2 to 13.1 and then to 13.2.6-1+fto10+1 I ran into several issue leading to the same error type: "undefined method `set_attribute_was'". When I try to create a new