Someone else also mentioned they were receiving 400 more HP in General Forums. My numbers may not be exact because of memory; but my completionist monk with 145 Reaper Points was around 3400 HP prior to this day's update and now (in Reaper 4) I was about 3900. My SP were 1100 something and now is 723.
I understand that some work was done to reduce the reaper load in to be more effective and reduce lag but I wonder if it is impacting reaper tree enhancements being applied.
Anecdotally I used to be able to solo r4 content with a breeze without death after U51 but after this update 51.1 I died 5 times in about 5 min from regular mobs. One Mob Archer did 4k 1 shot which seems extraordinarily high even if he crit hit (combat log did not say he did) with PRR about 180.
Something else is clearly off. Regular mobs are toasting me now. I will experiment more after work in groups and see if this was a fluke, but since I have a definite change/error in HP and SP since this update, I suspect more is happening funky, and I'm suspecting reaper buffs, etc. maybe not applying in game even if they are showing on the character.