for everyone that's having trouble on settlement missions:
you can't do nothing about duplicating craft itens (yet) but you can duplicate the materials needed to craft then on settlement equipments and machines.
to build the settlement builds, equipmetns, etc...all i had to do is create a kefir account (since we cant use google login) then log in on another device (I'm using emulator on pc) and complete all the buildings, crafts , etc there, just need to synnc on both devices, and making sure only one is logged at time.
I used my normal account first and then used my kefir login at the modded version
hope this works for you guys