What I did: set a trigger & tag to any clicks to the default container. It works.
The bug: I deleted all triggers and tags, but matomo doesn’t stop to fire all the deleted triggers.
So I created a new container and pasted the new tracking code to the website.
But now none of my triggers is fired no matter what I do.
I spent allready 3 hours to figure out why this does not work. No idea. Seems to be a bug.