Buried treasure missing

Found a Buried treasure map and followed it but after digging around I quit and tried to debug with the /locate command.

The command indicates a Buried treasure but there is nothing.

Seed: 134825431587558748

/tp -745 68 790
/locate Buried_Treasure
> saying [-743, ~, 793]
> Tried to dig at those coordinates down to the bedrock, nothing