Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes. Any airport, B787X.
Provide extra information to complete the original description of the issue:
Rudder and elevator doesn’t work when parked. It works when throttle is put into reverse. It also works when taxiing at or above 10 knots. 0-10 knots - issue occurs.
If relevant, provide additional screenshots/video:
No.