So far, 1.24 seems to be the most stable yet. I had to uninstall Start 11 for a bit as there were a ton of performance/crashing issues in the last couple of versions. We'll see if these reappear long-term, but so far so good.
A couple of things I've noticed so far:
With a two-row, small-sized taskbar, the tray icons all appear behind the clock.

Changing to one row fixes it although they look a bit cramped. Perhaps a small taskbar should only have one row of tray icons per taskbar row? Or shrink the icons slightly, if that's even possible.

The two-row taskbar also appears to be even more broken in medium size, the clock and notification button are completely gone. Clicking the blank spot in the corner does nothing.

I've also noticed that occasionally on my vertical monitor, the clock becomes offset and is partially cut off at the bottom of the screen. I haven't been able to reliably reproduce this issue though, and an explorer restart always seems to fix it.
Start11 v1.24
Win11 build 22000.675