Definitely not intentional. Not sure if I accidentally deleted the research back when I updated the mod or what, but I'll fix it and update the mod/test it to make sure everything's right. Thanks for bringing this to my attention!

- Hello again. Been a while since I've messed with the fcs so it seems I've forgotten a few things.

- Just fyi crossbow blueprints don't exist in the fcs as research the same way other blueprints do. If you try looking for any of the vanilla crossbows in the research section of the fcs you won't find any of them. Xbow blueprints are handled in the vendor lists, and it appears that xbow blueprints do actually exist in the vendor lists for the Dart Gun.

- I think you've just gotten unlucky in finding the bp. I tried looking for the blueprints a few minutes ago and was able to find them in World's End.