I started with a half used duck tape to repair a badly damaged crowbar and after it disappeared from my inventory backpack.
I thought it was already used up or i dropped it.
Tried again with a new duck tape pristine and unused.
Repaired crowbar and it disappears again.
Third time i leave crowbar in backpack and new duck tape in hands.
Repair crowbar and duck tape disappears.
Check all inventory and search the ground. Nothing.

Charnarus map on latest XB1 Dec. 3, update build.