When void forges are placed against a block it causes said block to become invisible and allow you to see through the world

Build a void forge and place it against a block

Possible abuse of said bug, to discover caves or other things underground

Info (please complete the following information):

• Modpack Version: 1.12.2
• Server or Singleplayer: Server
• Version the world was created on: 1.12.2

Additional context
Add any other context about the problem here and your thoughts about what could have caused it.

"Modpack Version: 1.12.2"

That is not the version of the modpack.

Either way, this goes to the Endreborn developer, which is no longer updating the mod (it seems).