My weapons PEN: Offin Tett's Radiant Staff, and PEN: Fiery Kutum Dagger are lost after using [Huntin

Family name:Radiant
Please help, my PEN: Offin Tett's Radiant Staff, and PEN: Fiery Kutum Dagger just disappeared after unequipping [Hunting] Beginner Matchlock. Please see below details. Thank you.

Description:
Unequipping [Hunting] Beginner Matchlock makes the user lose their boss weapon from the inventory.

Repro step:
1.Log-in to Arsha Ch
2.On pegasus, ride from Duvencrune to Eastern Border.
3.Stop at Eastern Border while having the [Hunting] Beginner Matchlock equiped, and go up into the tower.
4.Shoot from the top of the tower.
5.Observe inventory for equipment, and notice that boss armors were unequiped.
6.Re-equip armor, noticed that boss weapons are still in the inventory.
7.Continue to ride to Velia, unequip the [Hunting] Beginner Matchlock and observe the inventory.

Result:
Boss weapons: PEN: Offin Tett's Radiant Staff, and PEN: Fiery Kutum Dagger, are no longer in the inventory.

Expected Result:
Boss weapons: PEN: Offin Tett's Radiant Staff, and PEN: Fiery Kutum Dagger should be in the inventory

Note:
Attempted to search weapons in the warehouse/storage and horses, not found.
Attempted reboot and/or relog, weapons not found.
A bug report was also submitted.

Frequency: First Instance
04/13/2019 at approximately 4AM

Device/System:
Windows 8.1
Intel(R)Core(TM)i7-4790 CPU @3.60GHz
RAM 32.0 GB
64-bit Operating System, x64-based processor