Vehicle controls have been updated to be now perfectly consistent with the following rules:
1. Press a direction parallel to the surface (perpendicular to the yellow arrow) you are attached to, you will then start moving towards the adjacent surface in that direction.
2. If it is possible to move towards a direction you will do so by pressing this direction.
Rule 1. defines distinct movement along surfaces in any given situation.
You might find it handy that rule 1. can be applied in any corner case.
But the biggest change you will notice is the pointing of the yellow arrow. It is now indicating the attached surface/s more clearly.
I hope it helps!
Juri