Switch TV automatically to HDM1 does not work

Hello

When my Raspi 4 boots up, my Panasonic does not automatically switch to HDM1.I have to press the source button on the remote control first.

On my Samsung TV, on the other hand, it works.

Is there anything I can do to make it work on my Panasonic Viesta?

all settings in CEC are ok.

What else could I try?

It should work with the previous MC with an Nvida graphics card.