First off, let’s hope it was just a onetime thing…. In colder weather, I have had my clutch plates to stick together (not release) when I pull the clutch in. When I would put it in gear I would get a clunk. The clunk was the clutch plates releasing. It wouldn’t happen again until the bike sets for several hours.
Not sure this what your bike is doing. It helped my bike whenI changed from 20w50 oil to 15w40 oil.
Earl