With vanilla Factorio, you are always/almost always (not totally verified this) in a position to craft an item once you have done the research for it as all items needed to make it have their researches as dependencies of the one which contains this item. i.e. You can only get to Advanced Circuits once you have researched Plastics.

This doesn't seem to be the case with this mod as it will allow you to get a state where you can craft an item, but you can't yet craft the pre-reqs for making it (Advanced Circuits as an example).

Ah this is a good catch, you're right that Advanced Circuits should be locked behind Precision Smelting. Thanks for bringing this to my attention, it'll be fixed in the next version!