I have an XT M786 rear mech with a 3 x 10 setup. When shifting between rear sprockets the chain doesn’t always sit in the new sprocket during the first half a rotation after the shift. The rivets in the chain end up lining up with teeth on the sprocket. Then as a full rotation is completed the chain drops into place with a clunk.
Once fully engaged there are no issues. Its just the noise whilst shifting etc.
I have adjusted the B tension screw to set 5mm between the jockey wheel teeth and largest rear sprocket and the issue is the same with and without the clutch engaged.