After testing on my own after I found my save file bugged as well on this issue, I can confirm that setting loot rarity -> other to anything higher than "normal", so both common and abundant, will break foraging currently. At least on my 0 mods, never installed a mod, ever, even on another computer, installation. I also tested all the other loot rarity settings, and none of the others being set to even the highest setting seem to cause the issue.
This is immediately evident even when just starting a new playthrough. Just go into solo, set loot rarity to common or abundant on setting and then start. When you enter search mode you immediately get errors. You don't even have to leave the house.
Also, almost certainly related, when this error happens, crouching doesn't increase search radius.
