Been using the Zwift play controllers for a week, during multiple races and workouts, without any issues.
Today after race, power off PC, the Play controllers never power down. Now a few hours afterwards, the controllers still lit green and refuse to power down. Never had this issue before.
Then I unplugged the USB-C charging cables from the controllers (been sitting in the controllers since I mounted them on the bike) then they turned off.
The USB cable on the other end was not plugged into anything though. All OK now. Maybe this is something that changed with the last firmware update.