Loot table for Shadomoon Burial Grounds contain items from non-Mythic-Plus loot tables, which is a HUGE list.

Example, as a hunter, I can see 8 possible necklaces, They are actually coming from the Normal/Heroic/Mythic loot tables.

While in-fact, Mythic Plus has no possible necklaces.

Items used to be manually input but with updates to class/spec filtering that was not feasible. Now items are gathered from wowhead but clearly that’s not a good solution.

I’ll work on using the API to get items hopefully in game so they are more accurate. Thanks for the report.

Items are now sourced through the adventure guide so this should no longer be an issue. Thanks again for the issue report.