when I was spawning the 3D maneuvering gear to test my modpack, as i clicked the item in the creative menu the game crashed.

Here are 2 crash logs

crash-2021-02-18_09.42.37-client.txt

crash-2021-02-18_09.34.41-client.txt

Try removing Computing Frames and check if that still happens.

I have added a null check to InfinityLib in this commit, this will prevent it from crashing, but things might not work correctly.
If things break, report this to computing frames as well (they are the ones mixing code in there), perhaps they might have some better insights as to what is happening.