BUG in sidequest; Insecticide (stuck 1/75)

Sidequest bug, cant finish diablo at 100% for success , try mani time but stuck at 1/75: sidequest name : Insecticite (french) kill some insect at Landes embrumée. 1/75. No red dot on the blue circle. Try many time varyana spawn randomly and give one or 2, but now nothing.

I restart the quest.

Try to remove crossplay.

But now stuck 1/75. 8 hours of research and go to random spawn to kill varyana but nothing. I really love the game, but frustrated when you cannot complete. Look on different forum. Bug are also on ps5 cbox and pc on random people. Please help, we bought 2 diablo po play on 2 xbox and we have same problem. Please unbug us.