I'm trying to find Carrigon's "Shop in Bulk Medieval" mod to get around the un-interactable resources bug, but all of the sites that hosted it seem to be lost to time. Does anyone know of a site where I could find it or something like it? I don't have a Sims Asylum account and the registration appears to be broken at this point.

This is probably not a bug you're experiencing. Only certain classes are supposed to be able to pick up specific types of resources in medieval. Swap to other characters and try to interact again until you figure out who picks up what. Also I recommend http://modthesims.info/showthread.php?t=588547 this auto collect mod to make gathering resources less tedious.

Thank you for the recommendation! Unfortunately it is a bug, as listed here https://thesimsmedieval.fandom.com/wiki/Bugs/Glitches. I've been playing the game since I was a kid, so I do know that you have to use the doctor/mage/assassin/etc to collect resources other than wildflowers. I know that in the past others have used Carrigon's shop mod to get high level resources that are no longer collectible, or ChickieTeeta's version for pirates and nobles. All of the base game compatible versions that I know of aren't on accessible sites anymore, that's why I'm asking.

Found a copy among old files.