Unity 2021.1.16 + preview15 touches no longer trigger click-events (and others)

Unity Engine
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1

I Updated from
Unity 2021.1.7 and ui toolkit preview14 to
Unity 2021.1.16 + and ui toolkit preview15.
When I only update ui toolkit I get compile errors.
The project uses the old input system.

Now when I use a touch-display the touches no longer trigger button-clicks and other events. But the touch is recognized because the :hover-state is visible when I touch a button.

2

Oh my bad overread the following line in the changlelog of 2021.1.16:

  • Input: Touch Input doesn’t work in Play Mode when running an Editor on a Touchscreen device (1341159)