Trigger on timer state

I have an automation that looks like this:

alias: Intervallträning
description: ""
mode: single
triggers:
  - entity_id:
      - timer.intervalltimer
    to: idle
    trigger: state
actions:
  - data: {}
    action: timer.start

When inspecting the trace, clicking “Step Details” on the top level, I see the text “Error in describing trigger: Cannot read properties of undefined (reading ‘includes’)”.

How should I interpret the message? Do I need to do something about it?

Timer entities should not be triggered on by state look in the documentations, they use events.
Shouldn’t there be an entity in the timer start action also?

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