PLATFORM: PS4
SERVER: NA
DATE/TIME: June 23 2018, 11:12AM (Although this has been happening for some time now but after Summerset the new issue of it making your quick slot functionality drop to zero is new - and most frustrating.)
OCCURENCE: Everytime
STEPS to REPEAT Bug: Simply attempt to slot a supply crate from the writ rewards and cancel it.
If you happen to accidentally select "slot" the supply crates given from daily writs, then it renders not only the crate inaccessible, but also freezes the functionality of your quick slots (you can no long change what is in your quick slot (potions etc...). You will be stuck on the same one.
POSSIBLE SOLUTION: Move these crates from slottable to supplies. I don't see why they are even needed to be slottable in the first place.