Light transition time stopped working

I have a Legrand Netatmo dimmer switch next to my front door, connected via z2m and controlling a wall sconce.

For maybe a year I’ve had it set up so that when the front door opens at night, the light turns on, and after 4 minutes, the light slowly dims to off over the course of 1 minute (giving me time to find another light if I want to).

I should have paid more attention - but at some point in the past month or so, the slow dimming effect stopped working (it just turns off right away). I finally tried to troubleshoot the issue, and I can’t figure out what’s going on - other than that the “Transition” option doesn’t seem to have any effect - doesn’t matter if I’m turning the light on, or off, or just dimming to a different level - whatever I’ve tried the Transition timer has absolutely no effect anymore. I also tried re-creating that step of the automation in case something got corrupted but that also had no effect.

Am I missing something obvious, or is this a known issue with a recent release?