Ya might be a minor bug, will fix it asap, you can just set dodgy necklaces to 3 and have the exact same thing you want for now.
Or could have set food amount to 10, it's not like it matters much, you are only a few tiles from a bank in most cases
What you want to do it find a good balance between amopun of dodgy necklaces and amount of food per banking trip.
2-3 less neckalces gives you room for 2-3 more food
Khal Thieving (All In One) updated to V1.20:
- Fixed minor banking bug when using NPC thieving and using dodgy necklaces
Will be live soon
Enjoy!