Mod Version
1.16.5-1.2.7

Describe the bug/enhancement
There is no dust for Ancient Debris [forge:dusts/netherite_scrap] - this causes problems processing ancient debris in the Fluid Sieving Machine from Industrial Foregoing, which relies on matching ore and dust tags [and for some reason the other IF ore processing machines in Enigmatica 6 accept ancient debris instead of rejecting it; at the end of the chain the sieving machine outputs air].

I have also encountered the same issue, once i didn't get anything i thought that perhaps there's a chance of getting dust and a chance of not, but after processing 4 buckets of ancient debris fermented raw meat i got absolutely nothing :/

This has already been fixed in a future release of Enigmatica 6. EE doesn't add Netherite Dust because it is already added by Mekanism.

Mekanism adds netherite dust, not ancient debris / netherite scrap dust. The only ancient debris related ore processing item added by Mekanism is 'dirty netherite scrap'.