GWG[pfefferle]: What would you think about running the GitHub actions unit tests against ClassicPress as well as WordPress.... that's pretty much the equivalent of checking against 6.2 and 6.7
[Joe_Crawford]The Classic Editor plugin enables users to choose classic vs block for every post if you enable that with "Allow users to switch editors" under Writing Settings. I'm still sort of stuck because of mountains of legacy content but it's let me play a bit.