Assertion error when repeatedly enabling/disabling the "Highlight Marks" setting

QtCreator crashes for me with

ASSERT failure in QList::at: "index out of range", file /home/hofmandl/progs/Qt/6.7.2/gcc_64/include/QtCore/qlist.h, line 434 

Reproducer: see video

I wonder, why the setting takes effect immediately (see background in the video behind the dialog) even though I didn't click Apply or OK.

I also wonder, whether this is the same setting we already have on the two icons above the issue table, and if it is, I guess I'm ok with removing it entirely from the settings dialog.