Bug Small `Set Position` AABox dimensions lead to ring

Hello,
when I tried using Set Position (Shape: AABox) with a box that is "1 x 1 x 0.1".

It seems when my box gets small in any dimension, and I have "Position Mode: Volume" the particles will always leave a weird hole in the middle:


This doesn't happen if the AABox is thicker, i.e. from 1 x 1 x 0.5 I get the box properly filled with particles.
Has someone seen this before? Can we not have thin bodies as the origins of our VFX?


It gets even weirder when I make the box even smaller:



(All I want is for my particles to emerge from a wall. There is a `Set Position: Line` that does 1D, the AABox does 3D. But if I shrink one dimension of the AABox, it'll deteriorate into a ring, how can I do a Quad?)

 

Thank you, by reducing my VFX to a minimal example, I was able to isolate the culprit:
There is a `Collide with Signed Distance Field` which I had copy+pasted from a different VFX I used before. When I remove that, the hole in the middle goes away.
Interestingly, the `Collide with Signed distance field` has `lifetime-loss` set to `0`, so I'm surprised that this had any effect at all (In the previous VFX I copied it from, this was used to trigger an event)


Here is a link to the `*.vfx` file: https://www.dropbox.com/t/Cf7oAcM2OTLUZ4dj