Huh. I just tried Calc (6.0.7.3, Ubuntu 18.04) again this morning for the first time in a while and it crashed in seconds after right-clicking a few column headers. It's repeatable. When trying to navigate the very confusing document recovery dialogs to restart it, it then launched as Writer not Calc. I really wish it was an option but JFC. My experience with has always been so bad it doesn't even feel worth raising…
Could you make a video of that? I am clicking myself silly (ubuntu 18.04 / 6.0.7.3) and cannot repeat that behavior. I use calc a lot and it rarely crashes (less than excel/windows which, on my ms surface tablet, actually quite regularly crashes or hangs).
org.gnome.Shell.desktop[4355]: Window manager warning: Invalid WM_TRANSIENT_FOR window 0x9000024 specified for 0x9000965 (LibreOffic).
You have shamed me into raising a bug ;)
edit: raised, the 6.0 branch is EOL, doesn't happen in 6.4.5.2