Yeh, not sure what’s changed. Listening to zha_events I can still see the on_press command but not triggering anything (actually I since noticed on some of my dimmers it would work on a second press). My off button press was the only thing still working. Hold for all buttons seemed to be ok too.
For now I just replaced in the blueprint on_press with on_short_release etc for on, up, down and off. Can’t have the wife pressing buttons and nothing happen 
hmm, same here. Using a couple of hue dimmer switches though. Editing via Studio Code Server → config → blueprints → automation → stefanroelofs (in my case) → hue_dimmer_switchV2.yaml
Lines:
- conditions: '{{ command == ''on_press'' }}'
changed to the on_press to on_short_release for the ON condition.
and changed line:
- conditions: '{{ command == ''off_press'' }}'
from off_press to off_short_release for the OFF condition, both for single press/tigger.
But somehow the blueprint or remotes don’t pick it up…
Did a bit of looking at the traces, and got my off button to work by changing the light off conditions to have cluster_id: 6 and command: 'off_with_effect'