I just noticed this today, rushing second switch in a Shatters, and my plane occasionally acted like a tiered cloak (i.e. invisible, but no teleporting), which almost killed me. It happened when I place my cursor close to a wall; teleporting around the center of a room or hallway is completely fine. Below is a gif demonstrating the bug in the Nexus.
Demonstration
The first time, I place my cursor perhaps 2 tiles above the wall and I teleport. When I move my cursor closer to the wall (~1 tile above), then I don’t teleport.
Edit: Just tested this on Chrome too, so it’s not a Flash only thing. Also means not hax xd