Topic on Help talk:Paragraph-based Edit Conflict Interface

Fixed.

After I’ve copied my post to the “current” (left-hand) side and clicked the checkmark, the Preview button does nothing (using Safari v.12.0.3 on a Macintosh, at enWP & Commons). Sometimes I just cross my fingers and Publish, but if I need to verify that a template or link works as expected, I have to back out and start over, defeating the purpose of the conflict-resolver.

Thanks for the bug-report! I gave it to the developers, so that we can look into it.