It's all fine, and just a little dragging inside the geabox with it more likely when it's cold.
Left alone and idling, the clutch is fully closed (engaged) with the input gearshaft rotating and output held still by the rear wheel. Oil drag within the gear set (even in neutral) will put some rotation force on the output shaft, and so the wheel moves.
In reality it's a good sign as it shows the chain and wheel assembly don't need much force to move them, indicating brake, bearings etc are in decent order.