On the others I just ended up doing a long-press to rediscover it. However this plug is the one that the server runs from, and you can't reset the plug without turning it off (which isn't ideal).
I did already try it during a server reboot, but seems the blue/red flashing period is shorter than the time it takes to reload home assistant.
Looking for an alternative to rebooting/swapping plugs/reconnecting/reboooting/swappingplugs/