Invaders aren’t leaving after getting their kills. I’ve been having all of my revive tokens used before completing first encounter all from the invader. They are getting twelve kills and are still there. It is happening on Adamant Smuggle. Don’t know if it matters map or mode
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I noticed that there seems to be a bug with the Behemoth vehicle, if you're in it when the game goes to pull you to the invader spawn room it just, doesn't. It pulls you out of the vehicle and that's where it stops. For me when it happened, I had to die till I was out of revive tokens before the invade would end. Or in the 1v1 double cross just sit until the timer ran out. Taken the Behemoth off my abilities and not seen that since. Which is sad as that's my favorite one, but with a bug like that not gonna deal with it. Could be separate to what you've seen, but wanted to mention it in case you remember the invaders having the walker.