2 particle systems visibility

hi, i have 2 particle systems - let it be a circle (ps1) and an orbit around it (ps2). When the ps2 partiles fly over the circle, they are invisible, but for some reason when they fly in front of the circle, they are also invisible. Both materials are transparent. What could be wrong?

k, have found, it can be fixed by “translucency sort priority”., same like Z-order but for translucency :slight_smile: