The buttons on the device page now only work when held down as opposed to all previous releases before 7.29.2 or so where you could just press them once. This change in functionality was not mentioned in the release notes and has caused a considerable amount of confusion.
Garmin - PW is this intentional, or is it a bug?
See various other threads where this has been pointed out:
Garmin Express 7.29.3.0 on macOS 27 — Garmin Connect and Tools & Content buttons still do nothing
etc.
I thought I'd do a top level question so that people don't have to read the various threads.
Also, sorry I couldn't find the original thread where the person found this out. If you reply I'll credit you here.