Tree talent points cannot be obtained

Regarding the body quest, this is my second character. I've already completed the body quest and other quests for my first character, but with this second character, I can't complete the quest no matter if I fight Hivebrain Gland (more than 10 times) or encounter the Rifts in the T16 map (including more than 20 Rift Kings). Is this a bug? Or am I missing something?