i know other people have this issue, and i even have it with some first party content on occasion. basically, for those of you that dont even get it, a MOSParticle from a weapon (usually an explosion) sticks to the ground, and then (likely because the MO itself is made of the "air" material) interacts with just about nothing. the sprite slowly decays, usually through random events with other MOs.
what causes it, who else is getting it, is it being fixed, etc etc.
ive noticed it happens only on a higher deltatime with me.

yeah, this really bothers me. The only time I've really seen it consistently is with crobos, and the exact same effects in the first party stuff.

Flame throwers, Rocket engines, explosions. these all do that to me.

Same problems here, from my experiance they've been around since ATLEAST build 13 probably earlier then that. FIrst started noticing it in build 13 with the tear gas grenades, those things caused HUGE amounts of it.