D.F.

What does your SIP configuration look like? You can check with "csrutil status"

Is it an actual kernel panic? That would be a sudden shutdown, and a message your computer was restarted because of a problem. As for the half applied theme, well...

Are you applying the icons individually or as a theme? I'm trying to reproduce by manually setting the icon of the first app, and just getting a blank white image

Added in upcoming 2.5.3 update

Do you have a crashlog available?

Do you happen to have anything related to the icon labels enabled?

Are you using the stock style dock or Floating dock?

Unfortunately I'm not able to reproduce this problem on my devices, does it persist if you use Choicy to disable injection of both Lynx and Cephei into the Reminders app...

After some digging I found that it is disabled when the device is in Low Power Mode, a focus is active or the device is connected to CarPlay. I added...

I just haven't pushed an update yet, as I'm still working on a few fixes. The fixed tag here is just my own way of tracking what has been completed