Zigbee light group turns off unreliably

I have a 3 Zigbee light bulbs configured as a group using ZHA. I have an automation to turn this group off when triggered by a switch. But this automation only works about 50% of the time. Watching the logbook, I’ve noticed 2 different failure modes. The first one is that the group state turns off, but the individual bulbs all remain on.

The other mode is that the group state changes to off, then the state of the individual lights immediately changes to on, and then the group state also changes to on.

I would appreciate any tips on how to troubleshoot this further.

Here is a related WTH

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