[master/Qt6] qmlkonsole crashes when scrolling

Using pmOS Qt6/KF6/Plasma6 nightly packages on my op6-enchilada, I've noticed qmlkonsole crashes when trying to scroll up. E.g. when the last command's output is so long that the beginning cannot be seen on the actual screen.

I've launched qmlkonsole from gnome-console in order to get some crash log, seem some number referring to geometry being decremented from 0 in an unsigned int variable...