I've tried out a ParticleEmitter in Reality Composer Pro to produce a burst of particles that don't move (i.e. speed close to zero).
When viewing from different angles, it clearly looks like the particles are rendered exactly in the wrong order, that is, front first and back last. In other words, back particles obscure front particles. I would prefer it the correct way around. I've only tried this interactively in Reality Composer Pro, not programmatically, but I assume I would get the same result.
My Reality Composer Pro "File" (zipped):
https://gert-rieger-edv.de/Posts/Post-1/RealityParticles.zip
Screenshot:
Click on the ParticleEmitter object, then on its Play button, then select the Particles tab and click on "Burst" a few times to get a few random particles.
Mac Studio 2025 Apple M4 Max macOS 15.7.2 (24G325)
Reality Composer Pro Version 2.0 (494.60.2)