This is the meta-bug for tracking 12.0.0 release blockers. Rather than adding comments here, please file bugs and mark them as blocking this one. The 12.0.0 release branch was created at 8e464dd76befbc4a39a1d21968a3d5f543e29312
48953 is ready for cherry-picking (there is just so much noise with duplicates, that you might have missed this)