Lately I've been playing with ProjectRed. for a while I didn't have any problem but lately I see these, which I think are the bubbles when a item passes through a routed interface pipe.

Can anybody tell why is it?

Hehe this is indeed a particle effect gone way out of control and blown up like 1000x size. Not sure what caused it, but I am going to be taking a look at the FX Library soon...

This doesn't happen in 1.12. It might be fixed.

Happened due to floating point error. Was fixed a while back.