With a new Season come new issues and No.4 is no exception, as it seems the new dungeons added to the Mythic+ pool are having some loot trouble.
It seems some of the rewards for the old dungeons are dropping at a very low item level, even in +15 keys, not even at a regular Mythic0 for the expansion in question! So far we’ve seen two reports, both related to Mechagon, so it may be limited to just that one dungeon, but it’s unclear.
Hopefully Blizzard can resolve this soon, as the new M+ dungeons were one of the bigger draws of the season, and getting between players and their loot is always a bad idea.