Climate defaults to "manual" on turn-on action

Configuration
1

My Zigbee climate devices (Tuya TV02) behave different since a few days :
When sending climate turn-on command it switches to preset-mode=manual.
Previous behaviour was: switch to preset-mode=auto

Since I am using climate command, not plain MQTT message, I can’t say if that might be caused by a modification of HA climate or Zigbee2MQTT (all continuously updated to latest version).

Is somebody aware of the root cause?

2

Seems caused by modification of Zigbee2MQTT adapter for my climate device (Tuya TV02).
Sending MQTT message system_mode = heat (even if heat already was set) automatically sets preset_mode = manual.

I am not sure if this is to be considered as bug or feature. Anyway need to do a workaround, i.e. either check earlier system_mode or send subsequent preset_mode command