It doesn’t look that bad to me either and I’ve had a gearbox go very wrong I know what you mean about it being in the same gear and the revs drop for no reason then go back up.
A full oil change stopped this from happening on mine I think the oil gets worn and stops the gearbox from holding pressure.
Mine holds at 2000 rpm when your just at the range for it to change gear and sounds like it’s slipping which I’m guessing it is as these are not very direct gearboxs like bmw ones.
I don’t think there’s much wrong with yours though it’s when they bang into gear and Rev higher like a badly slipping clutch, you know there’s big problems.
But a full gearbox oil change won’t hurt it.
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