I encountered the issue on XBox Series S

I was playing with a friend, who is on XBox One.

I was playing as Drizzt.

Following the impressive 9/21/21 patch, it pains me to report that the pesky game-kicks-players-out-of-the-game-at-the-end-of-mission bug has returned. :/

From what we've seen (for reference: the same one friend and I have played almost daily since release; my report(s) describes the experiences of a semi-permanent party of two), 99% it is only the party leader (me) who gets kicked.

When this happens, there is also a 50-50 chance that the party leader's earnings do not appear in the reward chest and neither player gets credit for having completed the level. The level-completion error is entirely new; we did not see that in the last iteration of the kicking bug.