The locate buried treasure command has a tremendous lag

Put the summary of the bug you're having here

What I expected to happen was...:
I used /locate buried_treasure command, and I expected it will work speedily.

What actually happened was...:
The /locate buried_treasure command tooks so much lag.

Steps to Reproduce:
1. I typed /locate buried_treasure command
2. The locate of it doesn't shows up for a long time.
3. When I break something before the locate shows up, it doesn't drop an item.
4. After a minute, the locate shows. And then, the things I did, after I typed the command and before the locate shows, were reseted, including my location.
5. I tested with other /locate commands like /locate village, but they don't show any lags.