Locate command doesn't lead to the ruined portal always

It looks like it is possible for the /locate to find a location where no ruined portal is. It happened to me.

How to reproduce:

1. Genereate a new world with this seed: 4771793737520915822
2. Run this command: /locate Ruined_Portal
3. Teleport to the coordinates (The command is: /tp @s -320 ~ 192)

What I observed: You won’t find a ruined portal.

What I expected: I would find a ruined portal there

Update: It seems like it is inaccurate.