From 2021.8.x utility_meter doesn't work anymore

Configuration Frontend
1

I have this utility meter:

utility_meter:
  gas_meter_monthly:
    name: Contatore
    source: sensor.gas_reading
    cycle: monthly
  gas_meter_yearly:
    name: Contatore Annuale
    source: sensor.gas_reading
    cycle: yearly

Before 2021.8.x it worked. From 2021.8.x I have failure reporting on frontend "Entity not available: sensor.gas_meter_monthly"

sensor.gas_reading works very well

Schermata del 2021-08-10 18-14-51

I have no errors on log.

I can suspect something with new energy (?)

2

Most likely your sensor.gas_reading changed as a few energy integrations changed.
What does it say using Developer tools - state and which integration is it based on?

You can also check Breaking changes 2021.8