Question Artifact in particles from sprite

Hi,

newbie here - the sprite is self made pls don't laugh at it

I am seeing a weird artifact in particles from a sprite using the 'Texture Sheet Animation' in the particle system. The artifact is visible both in the editor and in the running game, as well as in the built game... I confirmed numerous times that the artifact is in fact not in the sprite itself. I wonder if someone knows what is happening and how I can get rid of it.

the artifact in the bottom left corner - every particle has the exact same artifact


the IMO important particle system settings


the sprite itself (obviously without the artifact) - the sprite is a PNG

 

I noticed that I messed up the tiny shadow to the left a bit ( I was aware of it before but didn't bother )... I was wondering if that messes somehow with whatever the engine does when rendering the particle, so I corrected it and at least it got better:


you can still see an artifact but it is much better and unnoticeable in my "game"

I also noticed that the image of the particle seems blurry compared to the original, so I am wondering if some form of anti aliasing happens and maybe that messes things up ¯\_(ツ)_/¯

although I have a workaround now, still some questions remain:

• is there some anti aliasing happening (or something similar)? can I disable it somehow?
• whatever happens it seems to be doing weird stuff under certain conditions with pixels close to the edge, so I am ASSUMING that there might be something not quite right

 

hmm i found where the AA is coming from (the import settings for the texture) but disabling AA and compression there did not eliminate the artifact, so I am still searching