That's strange. There shouldn't be any way that the problem of the pointer not being able to move past a certain point on the screen can happen when using Bluetooth passthrough. But maybe what you're experiencing is that the pointer is cutting out rather than "getting stuck"?
If you have any light sources that are above the sensor bar, try turning them off and see if it makes any difference.
If you have any light sources that are above the sensor bar, try turning them off and see if it makes any difference.

