Gear shifter washer ?

Just a guess but I suspect the washer is meant to be loose and is there to help protect the shift mechanism in the event the bike is dropped. It’s actually a mod I did on my Scrambler for exactly that reason, although the shaft sticks out sideways and therefore more likely to be pushed in. If that’s the purpose then any oil leaking would be due to an internal seal failure, not the washer being loose.
 
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Just seemed to be a bit weird to me a washer rattling around on a 35k bike lol