Thank you for clearing that up for me.
I might be right with my opservation that after I split that footage and remove a part of it that all changes in the filters are applied to the removed part of the clip instead of the remaining footage on the timeline.
Which is clearly not what I want
The issue is after the split and remove action I can not select the remaining footage by clicking on it.
The red frame tells me that it is already selected, so those visual/audio changes should show an effect on it.
Only by telling Shotcut to apply those changes to the intire track I can continue my work.
Just to reproduce this isssue
I import a video
Create a video track on the timeline
Drag and drop the video to the video track on the timeline
search for a possition to split the footage and right click > remove the unwanted part.
I just did a test ...
If I delete that unwanted part of the clip by using the keyboard (delete key) it works as it should be.
So there seem to be an intentional difference between these two.
But to be honest, I don't really see a use for the effect that the right click and remove offers me.