Blizzard have fixed some of the problems from the recent list of known pre-patch issues list as well as added a new one. You can check out the full list here

Known Issues (Source)

Some NPCs who redeem codes from outside the game have been temporarily removed. They will return to their usual locations soon.

The code redemption NPCs have returned.

Weapons that drop from all M+ sources, including the Great Vault, may have an incorrect item level.

Issues with M+ weapons have been resolved.

Following Rated PvP matches, except for Solo Shuffle, accurate credit is not being provided to players. The fix for the issue will require realm restarts.