Needed to add a UE4SS script to fix the boat duplication issue. Disappearing issue was fixed by disabling and re-enabling when getting back to the boat. Collision false-positives was reduced by ignoring collider position when it is too far off expected X and Y positions.
Still not ready for next relase, needs some update migration code.
For some reason `SetActorsAI 0` (when run on a ref in another cell) seems to immediately CTD in the new 1.1 update. So I am commenting that out in all the result scripts for now. It doesn't seem to affect the collision detection at all, so I think it is fine to leave commented until hopefully virtuous fixes it.