Bug? Timecode Show Learn Button for start Learn-Mode not work

I'm trying to record a time code show.
For this I would like to start the learn mode.
I press the learn button but nothing happens.
If I start the learn mode via softkey, everything is ok.
In this case, the Learn button also lights up green and I can exit Learn mode by pressing the button.
But do not start again via the button.

When I try to learn Marcos with the Learn Button, the button works.

GIO with EOS 3.0.2 Build 6

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