The development team understands it can be discouraging when materials are lost when disconnecting during crafting and they would like to do something about this.
If we were to implement an "resume crafting" feature after a disconnection occurs, there are a few things that must be taken into consideration. It is difficult to confirm whether or not the disconnection is due to a connection/technical issue or if it was done intentionally. There is also the possibility that this system could be exploited so we must be very careful during the planning phase.
While considering the above, the development team would like to look into this further, but they are not currently planning a resume after disconnect type of feature.