I had an observing run with the latest git version of kstars (kstars-3.5.4-2157_g7498a113d, self compiled)
While stability had improved (3.5.4-2110_ga4b519ad1 was crashing repeatedly while just guiding), this one still died during focusing after the second filter change (which unfortunately costed me 50% of the rare good night sad.png ).
It died with a segfault, and even created a coredump.  But unfortunately systemd-coredump limits size to at most 2GB, not enough for kstars:

BFD: warning: /home/pit/core.kstars.1000.9e88338e5e684b33aa6b617f427a7e42.16666.1625442302000000 is truncated: expected core file size >= 3329597440, found: 2147483648

• EKOS scheduler used to print the twilight times for the current day, but no longer does sad.png. 
• The new colors of the additional catalogs have room for improvement.  E.g., I disabled the LDN catalog because that red color is completely killing the sky view (IMO, of course).  Unfortunately I found no place to change that color.  User error, or not implemented?
• Right-clicking a target (e.g., to get the detail view), has always been a bit random when zoomed in.  But right now it's close to impossible for larger targets.  E.g., I view IC4628 at 4.9 degree FOV.  No matter where I click within that cyan diamond, it only tells 'Empty Sky'.  To 'find' the target, I first have to zoom out to around 37 degree FOV to get a 'match' on right-click on the second or third try....
• For the above case (IC4628) the info-box in the upper right corner says (only) 'ESO 332-EN14' - not very helpful for most users, I'd assume.