In my past few play sessions I've:
-Revived a friend
for which none of the PS4 trophies have unlocked. I was playing public matches on the klei hosted servers. I did unlock a trophy during that time for trading some extra items in. My psn is Gammagoll if that helps.
Re-killing the same enemies or reviving players have not caused the trophies to pop so it must be a consistent error.