There are risks and annoyances with installing any beta along with getting to see new features etc
Be aware of them.
It may not fix your issue as it is should have been normal already in 12.4.1 in the first place.
Taking it back to apple customer care might help.
It seems it indeed has fixed nothing - 1 hour after, minimal watch interaction and i am 5% down. Am i right in thinking, this is not a normal consumption?