Hello, between 1.20.1 and 1.21.1, the codec for ItemStacks changed and the inner key of an item stack is no longer item, it's id now. You have a few recipes that use the wrong inner key are not valid. For example:
https://github.com/XxRexRaptorxX/AllTheCompatibility/blob/main/src/main/resources/data/allthecompatibility/recipe/industrial_reborn/hammer/aluminum.json#L19

It should be "id": "alltheores:aluminum_plate" instead. This issue occurs on multiple crafting recipes.

Industrial Reborn has not yet received a version for 1.21 (at least none that I know of) and therefore I have not adapted the recipes