Hello!
As the title states I lost about 11k of Gunsmith materials & ontop of that ~1.6k Weapon telemetry.
I noticed this @ the tower,
after me and my clan on discord had done 2 quick runs of Last Wish from start to finish.
I bet I'm not getting any of it back but I thought it would be worth letting the rest know about it, especially since you might have close to or a full inventory (which might be the reason behind this bug)
but then again I don't see why it just didn't go to the postmaster,
rather than discarding all my materials or stacking.
I don't got video proof of it happening as I didn't think a bug this major would happen just then,
Bungie does have a inventory system so they should be able to see my inventory in-before with ease.
EDIT:
I managed to find the entire stack in my vault, however I couldn't find my Weapon Telemetry...