Is is_follower obsolete?

After testing a bunch of cases, it looks like is_follower always returns false now?

If I follow (“join for free”) a campaign the membership will be created with null pledge values, as expected.

A tier is returned. But is_follower is still false.

Has it been deprecated in favor of free tiers?

I can work around but since former patrons will not have null pledge values, there’s not way to tell if a former patron is a follower.