I'm Use:
Compact Machines version:1.12.2-3.0.18-b278
Forge version:14.23.5.2838
I am not using Optifine:no
SpongeForge: 1.12.2-2838-7.1.7-RC3774
Description of the problem including expected versus actual behavior:
A tunnel must be created. But, after starting the creation, an invisible block appears.
Steps to reproduce:
Video reproduce
After this procedure, in a hopper position arise invisible block.

Same issue as above. Crafting creates a ghost block in center of area and no tunnels. Works fine in singleplayer.

Modpack: Interactions 1.9.1
Compact Machines: 3.0.18-b278
Spongeforge: 1.12.2-2838-7.1.8-RC3964
Forge: 14.23.5.2838

I replace in recipes hopper to other block (piston) and craft started work normaly.

Closing this as an issue with SpongeForge since other users have not reported this issue and Forge itself works fine. If someone can get me a server dump or a server setup to reproduce on SF, I can reopen and investigate, but likely to be low priority as CM4 is being worked on.