See if the Administratifve command prompts can fix it;
sfc /scannow
dism /online /cleanup-image /restorehealth
The DISM one did actually fix another issue of mine concerning Task Manager so maybe it's worth a try here.
The SFC said it found no issues. I ran the DISM. But still have the problem.
This was just updated from MS Store:
Ok, I will see tonight if I can get it to install.
Otherwise I can reinstall this build 258, or the new beta build 282 over this one.
Or do the roll back to Win 10 19043 and install the new Beta build 282 from there.