I starting writing up the same report 2 hours ago but got distracted and you beat me to it. I can add one thing. I had an old test forum at version 2.4.0.beta9, and tag groups worked. Then I upgraded to 2.4.0.beta11, and it fails as described above. I have no plugins installed on that instance. So I believe the breakage is after 2.4.0.beta9.
5 Likes