Can confirm now that the names of the bosses in the combat log will only be missing for Ancient Temple and Abandoned Mine dungeons on both bosses. Happens sharded and unsharded and happens very often. Would guess 1/4 bosses.
Another thing I would like to add (combat log related) is that I noticed that if you compare 2 combat logs off 2 ppl, that their total damage done on an enemy is sometimes different. This is because sometimes a combat log line is missing by one of the two players. I notice that a log line is missing more often when an enemy is moved around. I am guessing the client is missing that a projectile is hitting the enemy and doesn’t log it? Can give ppl different results in their view of how they are doing and is not the greatest thing. It seems to happen mostly for the player with the combat log that some lines are missing of their own damage.