User's choice of status indicator doesn't work

No problem, Johnny, and you’re too kind.

Sounds logical, for class thermostat.

But, hold tight:
I took a peek at OTGW MQTT app by Robin, it’s just possible to use multiple thermostats using only sub-capabilities.
But, you’d use the class other, and now you can use the status indicator as you wish (now it’s not trying to ‘be’ a thermostat class)

Screenshot from 2024-07-10 00-20-57