Synchronisation - different behaviors while not changing the code

My setup:
I have two eq3 bluetooth thermostats and one input_number to controll them - this part works fine.
In addition, when one of the thermostats is changed, input number should be set to the value - this part works fine aswell.
But the problem I’m facing is: the changed value of input number should then be able to adjust the other thermostat as well by triggering the first automation - and this part may or may not work. There no pattern behind it.

My automations:

- id: '1000000000411'
  alias: Temperaturänderung
  trigger:
  - platform: state
    entity_id: input_number.zieltemperatur
  action:
  - service: climate.set_temperature
    data_template:
      entity_id: 
      - climate.thermostat_1
      - climate.thermostat_2
      temperature: "{{ trigger.to_state.state | float }}"
  - service: persistent_notification.create
    data_template:
      notification_id: Thermostatsteuerung
      title: Thermostat
      message: > 
        Temperatur wurde um {{ states.sensor.time.state }} Uhr von {{ trigger.from_state.state }}°C auf {{ trigger.to_state.state }}°C geändert.
- id: '1000000000412'
  alias: Temperaturübernahme der Thermostate
  trigger:
  - platform: state
    entity_id: 
    - sensor.thermostat_temp_uebernahme_1
    - sensor.thermostat_temp_uebernahme_2
  action:
  - service: input_number.set_value
    data_template:
      entity_id: input_number.zieltemperatur
      value: "{{ trigger.to_state.state | float }}"

The second automation triggers when the thermostat values change. The following sensors are available for this purpose.

sensor:
  - platform: template
    sensors:
      thermostat_temp_uebernahme_1:
        value_template: "{{ states.climate.thermostat_1.attributes.temperature }}"
        friendly_name: "Temperaturübernahme der Thermostate"
  - platform: template
    sensors:
      thermostat_temp_uebernahme_2:
        value_template: "{{ states.climate.thermostat_2.attributes.temperature }}"
        friendly_name: "Temperaturübernahme der Thermostate"

I’m grateful for any help.