Based in

https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/aac911d2634a2e51023fa39c3b015b590b46914c#nms-patches%2Fnet%2Fminecraft%2Fserver%2Flevel%2FEntityPlayer.patch

https://hub.spigotmc.org/jira/browse/SPIGOT-7800

https://hub.spigotmc.org/jira/browse/SPIGOT-7801

Currently all the drops are managed in the same list passed to events, this ignore the "origin" and can cause a diff behaviour from vanilla where:

• LootTable
  • This spawn in the feet of players with not alterations in location
• Inventory
  • This spawn -0.3 from eyes

For handle this the options can be:

• In the events move the drops from loottable to another method like getLootTableDrops() and remove from getDrops(), currently a breaking thing
• Internally track what items are from what origin and track changes in that item but this is just an horror in maintenance...