For anyone having problems with shadow trails like I posted before, turn r.Shadow.Denoiser.TemporalAccumulation to 0 and it should fix it 
and without that command now raytraced shadows flicker so can we get a fix for that in preview 3? 
For anyone having problems with shadow trails like I posted before, turn r.Shadow.Denoiser.TemporalAccumulation to 0 and it should fix it and without that command now raytraced shadows flicker so can we get a fix for that in preview 3?