I'm running Django 3.1 and social-auth-app-django 3.1.0 so I can authenticate against MediaWiki. Everything works, but want to start moving toward more modern releases. If I upgrade social-auth-app-django to anything newer, I get an exception in the authentication flow:

Direct assignment to the forward side of a many-to-many set is prohibited. Use groups.set() instead.

Has anybody else seen this problem?

It looks like this was first reported about 18 months ago, with no response to the issue. I fear that the whole python-social-auth project is close to abandoned. There's been a total of 4 commits in the last 6 months. Unfortunately, I'm not aware of any viable alternative.