Newly added Tradfri Switch toggles all Zigbee plugs

Hey everyone,

I had to restart my HA VM today because all my Zigbee devices became unresponsive.
Afterwards, most devices worked again right away.
Among the few that acted Up was a IKEA Tradfri on/off switch.
I removed it from Phoscon and re-connected it. So far so good. But suddenly, without any setup, the Switch toggles ALL Zigbee smart plugs that I connected via Phoscon and I can’t find any page in the Phoscon App where I could set anything like this.

Does anyone have some advice or similar experience to share?