ASU upgrades have been tested and all tests ran seamlessly for tested devices and profiles. If you encounter issues with ASU upgrades, please report them on the respective client threads:
There is currently an issue with LuCI's System -> Overview page, see OpenWrt 25.12.0-rc2 - Release Candidate - #200 by aLiArLa for the details and the subsequent 3-4 posts for fixes. This should go away in a day or less.
EDIT
The fix is in, just upgrade that evil package (note that use of apk upgrade is generally dangerous, but it is safe for this package this one time):
apk update
apk upgrade luci-app-attendedsysupgrade
