RFTools 5.83 and Rftoolsdim 4.54 (In both AllTheMods modpack ver 2.1 and AllTheMods:Expert 1.0.24 modpacks)

Creating a netherrack dimlet by "cheating" (shift + double-click) when used in a dimension creates a chisel variant of netherrack instead of vanilla netherrack. Tried on multiple dimensions, every time the material would come out as chisel and not vanilla.

I have not yet tested with a material absorber or other material types to see if it's limited to just netherrack or if other materials are affected as well.