Prone is interrupted automatically with auto-sprint

Hi,
I have set auto-sprint and bound it to the forward key, so I always sprint.
I need sprinting mostly and do not want to use two key for this every time.

The problem is, that this interrupts the pron position, as soon as I push the forward button.
This should at least be possible to deactivate, so prone position only gets ended when the prone button is pushed.

Thanks and best regards
Hyper