Modpack version
Version 1.56 (Latest as of the moment of writing this)

Can the issue be reproduced?
I guess so, just try to create the forge.

Issue
It's really all said in the title and the screenshot already. Also experienced this with a couple other "gated" recipes still allowing the normal one to be used. Might want to look into it.

https://imgur.com/gallery/l48n1nR

Edit: when trying to create the forge via the gated recipe it doesn't want to craft: https://imgur.com/gallery/jvJLnqu

I highly supsect your scripts are broken. Do you get some error messages when starting up the world? And did you change something in the pack? Added and especially disabled/removed mods?

**** yeah.... going to cancel this post. The only thing I disabled was the AE2 channels, but i'll look into it some more. going to close this one straight away -_-

Yep, there is your issue. Removing the controller breaks scripts, due to the controller not being there anymore. There have been scripts around to fix that, but I have no access to them at the moment.