What is causing these trails on the hands and arms here?

Development Rendering
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1

I got this environment on Fab and it uses a lot of emissive lighting which I know can cause some weird issues sometimes. When my character’s hand moves in front of the ground plan it causes this weird trailing effect when rendering. I don’t think it’s a motion blur issue, though I may be wrong. Not sure what exactly would cause it.

2

Odd.

If you hide and fog/atmos does it dissappear? If its coming from VolumeFog you can try r.VolumetricFog.HistoryWeight = 0

Maybe try going from TSR to TAA to see if its TSR.

Or maybe mess with the Lumen Scene and Final Gather Lighting Update speed if its comeing from Lumen.