Scene Transitions do not work as expected

I am starting to use Home Assistant. So I read the docs, searched the forum etc. but did not find a solution to my problems. Scenes do absolutely not work as I expect them to do.

I try to break down my problems into separate topics. The first one being the transitions that do not behave as I expect.

I have a group of 2 RGB-lights. Let the Initial state of the group be color red at 50% brightness.

If I call the service scene.activate with a transition time of 10s for this scene again nothing should happen as the lights are already in the desired state.
But what I observe is that the lights are dimmed down and then slowly move towards the target brightness.

If I start with the lights off, the lights first get switched on with the last state they were in before they were switched off. Then they are dimmed down and only then a transition to the desired state is started.
In this case I would expect the lights slowly dim up from the off state to the desired state.

This is the same for zha- or zigbee lightgroups.
I also have a 2nd location where I temporarily have to control the lights via deconz - but I can not test there as this is a productive place …

My Lamps are Ikea Tradfri RGB-Bulbs (E27 805 lm) controlled by a Raspberry 3 with the Rasbee Module (waiting for the Home Assistant Yellow to be shipped).

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