I just recently purchased a Mazda 6 manual and there is a clunk in the steering wheel. Like it jumps a little. I already had all my ball joints and tierods and everything else inspected and the said they couldn’t find anything. It clunks and feels like it moves towards me. Doesn’t seem like there is any other problem
Did they check your motor mounts? If you've got the V6 there's a "dog bone" mount under the engine that isn't uncommon to break and it'll allow the engine to move around enough that you might feel it when you're re-engaging the transmission.