On Live and Beta and loot list is empty. It's empty in Mythic dungeons on live and beta. It's empty in raids as well.

On Beta all i run is ElvUI. On Live i run a bunch of other addons.

Clicking the arrow up and down does nothing to show the loot list.

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Can confirm I'm having the exact same issue, ran hfc mythic yesterday and none of the possible bonus loot was showing up. I dont use elvui so that's not related