Unit Bills' Particles in gamemode ports colliding with thin air

[ABritishPanfish]

Whenever I use the Unit Bills item in the gamemode ports, the particles seem to collide with invisible hitboxes.

Here’s an example of a large stack just floating there.

[J_P]

A followup question: what are those magenta-coloured areas in the shot?

[CarbonCopyCat]

I’m guessing they’re the glowing tiles around the game world teleporter.