Zigbee lights do not turn off fully when switching off with transition time

Hi all, I have a weird issue. It used to be with only one light, but I bought a new one and this has it too. The issue is repeatable but not with 100% fidelity, which means it usually happens but sometimes it doesn't.

The lights don't seem to be able to handle transitions. If I switch off the light with an action command from the developer tools, they will always switch off if I do not check the transition check box. If it is checked, seemingly independent of the value, the lights will switch off in HA after the transition time, but mostly they will still be on at their lowest power level.
This annoys me quite a bit because I like to use transitions when I switch lights.
Does this sound familiar to anyone? Is there a fix?
The lights in question are

  • IKEA TRADFRI bulb E27 WS globe 1055lm, Firmware: 0x03000023
  • EGLO_ZM_RGB_TW, by AwoX

I have a sort of workaround with an extra automation but if someone has some insight about the cause and real solution, it's much appreciated.

I'm using ZHA by the way, with a Sonoff dongle E. The zigbee network is excellent in the room these lights are in.

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