Ikea Switch magically binded to Xiaomi Power Plug

Button from Ikea Outlet (E1743) - turns on and off my Xiaomi Power Plug (ZNCZ02LM). Looks like, they binded directly - it works ever when zigbee2mqtt is stopped.

I never bind them. And when I try to unbind - I receive error:
Failed to unbind cluster 'genOnOff' from 'Bathroom Button' to '0x00158d00030a55c8' (Error: AREQ - ZDO - unbindRsp after 10000ms)

Can anybody explain, why they binded and how I can unbind them?

link to the issue on github https://github.com/Koenkk/zigbee2mqtt/issues/2059

I installed the dev version to make it work…

I already use dev, but too old version.
Update only doesn’t solve problem. But after reset & rejoin plug (=> removing from group 0) everything is ok.