Yes that is strange, and the battery health of your iPhone is still ok. Also Apple has stopped signing 14.4.1 so you can’t downgrade. Hopefully the next update will correct the issue. One last resort could be to restore the iOS software and firmware. You would need a Mac or pc with iTunes to do this. Connect your iPhone to the the computer then if iTunes opens close the app. On your iPhone press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button until you see the recovery mode screen. On the computer, iTunes will open and will give you two options Update or Restore, choose Restore this will install a fresh copy of the latest iOS version and firmware for your iPhone. Please note this will wipe your iPhone so try do a backup first and you will need your Apple ID and password.