Version 1.6-20 marked as compatible with MK1.12 & MK1.12.1 but in reality is hard dependand on MK1.12.1

That's because I used a 1.12.1 Forge version when I built the mod. I didn't think about it affecting the version the mod is for according to mcmod.info. I marked the file as compatible with 1.12.1 and 1.12.2 now since IE 0.12-72 (which IW 1.6-20 depends on) has the same issue (so uploading a new build would just cause the error to say Immersive Engineering rather than Industrial Wires).