report : Maintenance Mode - Mandatory Zereth Mortis Mounts

Realm: Dornogal

Character (name, faction, level...): Vanezmuste - Dracthyr Hunter 76

Difficult mode of the instance in which you found this issue: Normal zone

Complete description of your issue (do not forget to specify the issue, all conditions for making the issue to happen, and if the issue is related to a phase, specify the phase in which you found this issue): For this part of a quest you need to collect 4 'Attunement Codex' in order to open 4 terminals.
Drop the codex from elites around (It actually drop Itemid: 189492) But when you pick it up. it doesnt appear into inventory and cant open Arrangement Terminal...
Tried to delete cache, take quest, delete cache again, relog, nothing works.
Did entire campain and also unlocked shadowlands specially for this mounts and now because of this quest I cant simply continue... Waited 5 days for Cipher to be crafted. Is so sad :(
Steps for reproducing the issue: The quest itself.

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