Lingering shadows that stick to the ground after movement - how to resolve?

[ClockworkOcean]

I notice someone here having the same problem

Niagara disable sprite shadow?

… How do I disable shadow casting on a mostly empty sprite emitter? I’m spawning a bunch of particles that follow the actor with a custom material. the material is emissive. The renderer on the Niagara Emitter does not seem to offer any shadow settings. There must be a hidden option somewhere? AND… it’s the distance field shadows that are the issue… probably due to the contact shadows…

Have you tried changing the emitter to CPU?