I mean this thing:
This is not the scrollbar (which is on the other side of the window). It seems to show the output of the last command run, but if I scroll back it seems to show "random" lines. The best explanation to its behavior is that it groups outputs that have been produced within a short time of each other but this only applies to the last command.
This appeared when I upgraded to Kubuntu 22.04 (so running Konsole 21.12.3 now).
Any hints?