The Graves datapack creates a grave when you die to hold your dropped items. Recover the items by interacting with that grave.
List your graves
Use /trigger graves to list your graves.
Recover your items
- Note any location information shown when you die, and return to the area.
- Find your grave.
- Right-click or left-click the grave to retrieve its contents, as described by the pack author for this version.
Sources
Official Vanilla Tweaks 26.3 pack descriptions, Graves 4.1.2.