Cannot upgrade past 2021.4.6 - ZHA issues

Hello everyone. I’m wondering if I’m just doing something stupid because obviously, if Zigbee were totally dysfunctional there’d be a clamor. But for me, when I try to upgrade past 2021.4.6 I get a situation where I can turn ON a ZHA light, but I cannot turn it off.

This has been tested with core-2021.5.1 and core-2021.6.4… both same symptom.

Home Assistant is running on a Virtualbox VM within Ubuntu.
I’m attempting the update using the update button in the supervisor/system screen.
I’m using a Sonoff controller flashed with Tasmota for the radio (yes, a wifi-zigbee bridge).

Does anyone have any experience with this?