So the only change I made was added the API and your Mod and since then at random sometimes multiple items in a chest sometimes none in fact most of the time none of them error out. But when they do it has this odd number count like in the image below:

The First Tin Cable. 1134 Item Count. When I click it then auto cleans it up.

If you add up all the Tin Cable it comes to 1134. So I assume it might be something running when it should not run :)

For a list of other mods I use:
https://www.curseforge.com/minecraft/modpacks/modern/relations/dependencies

Thanks.

I think this project dead and you use the other github now. I found this due to the in game URL btw.