A: person with resources
B: Crafter
-----Steps-----
1.A gives resources to B
2.B crafts items using them.
3.B gives crafted items to A
4.B moves to the new save point or waypoint
5.A leaves the room (When A leaves the room, A loses all crafted items received from B, but gets all resources back as well. Therefore, A lose nothing and gains nothing)
6.The room automatically terminated (server detects anomally?)
7.At this point, server lost the track of B giving crafted items back to A (from step 3), thus B still has crafted items. Therefore, B freely gets crafted items. (Because, A gets back resources)
Repeat