When trying to ore triple copper using the purifying chamber, crusher, enrichment chamber, and smelter the copper did not want to transfer into the furnace. I looked into it more and found that the copper dust produced by this process does not have any smelting recipes.

The enriching factory is set to auto output with the output directly touching the smelting factory. Same thing happens if items are to be transferred using logistical transporters.

Version:

forge-14.23.5.2847
mekanism 1.12.2 9.8.3.390
mekanism generators 1.12.2 9.8.3.390
mekores 2.0.13

This issue also occurs with tin dust.

1.12 is no longer supported, but I assure you both copper and tin dust had smelting recipes in all our releases. Make sure your mod pack or config aren’t blocking the recipe.