Android, so at least we know it's equal opportunities gash!Mine's doing that right now, as just reported in the iOS 14 thread. Hasn't updated since 1552 yesterday. Hope it's just temporary, as checking the SoC when I've left it charging somewhere is actually quite useful!
Are you on iPhone or Android?
Hadn't been looking at the iOS thread for obvious reasons.
Don't worry though, it will come back eventually. At least it always has so far. It goes through phases of just greying out, although seems to tie up with times of possible high usage, like around dinner time.