***** SOLVED *****
I have 3 parts already and am trying to get the 4th together with the blueprint.
Have:
Pistol: Trigger & Mechanism
Pistol: Sight & Rail
Pistol: Receiver and Paint
Trying to get:
Pistol: Grip & Tags + blueprint
I have been doing Space Administration (non invaded) a few times now on Hard and once on Normal just to check, still does not drop.
I already have the Liberty on an alt so I know how to get it, but this time I cant get the last piece and blueprint to drop.
I do have the blueprint for the Liberty GS 500 available at my crafting bench, if that can be of any lead to a dev.
Please investigate this.
***** UPDATE ******
I had another Liberty in the stash.
Moved it to an alt and ran the mission again.
Boom, both the last part and blueprint dropped.
It is still a very wonky mechanic around dropping parts and not being able to already have the exotic in inventory/stash.
I really hope that this weird mechanic changes in the future.