Hi guys
it looks like another unfortunate regression. If I burn UIFlow2 firmware 2.4.2 onto my M5StamPLC I can control the relay and LED just fine.
Unfortunately the UIFlow2 firmware source code in github repository uiflow-micropython (at the time of writing this) is still on version 2.4.2. So it's impossible to tell what has changed between 2.4.2 and 2.4.3 causing this issue.
Thanks
Felix