@kingarthur figured out where the bug came from. It can be treated as fixed. Angels Petrochem changed Sulfur Processing Tech to its own, so the Recipe could not be unlocked. The tech names mismatched and it was unobtainable Sorry for bothering you all, but at least we resolved this quite hidden bug.

On the mod discussion page another user presumably faces the same issue as me and my friends. I personally do not think the issue is related to just mulitplayer, because it also occurs in newly generated singleplayer only savegames. On first thought it has to be related to the modpack, but I tested ...

Hello mod maintainers, I want to report a bug here, that did not get addressed already. I opened a GitHub issue , but got no response there. So, I am trying my best here. As a short summary: The Nitrobenzene recipe is unavailable. This issue occurs just in some worlds. In FNEI the only recipe is Nit...

@kingarthur have you already looked into my GitHub issue?
I can provide more info if you need it.

(WIP)