I tested one edge case that we have to look at.
The World viewer has a value 'batch pentrails'.

When that is true, the script just pit the player at the last position
in the script.

The stepper goes trough each line, so the result differs.

So a script:

car forward: 50
car turn: 90
car forward: 50
car turn: 90
car forward: 50
car turn: 90
car forward: 50
car turn: 90

You will get different results for single stepping and other execution
of that method.

Karl