Ugh, that bug sounds mad annoying! Looks like the update messed up the lock screen UI and stuck the battery percent at some random number.
Best move is to try restarting your phone first. If that doesn’t work, clearing the cache partition might help — sometimes old files cause glitches after updates.
Samsung usually patches these quick, so keep an eye out for a hotfix soon. Meanwhile, you can report the bug through Samsung Members to get it on their radar.
