Ancient City is buried when I use the "/place" command

I used the "/place" command so I could generate an ancient city, so after I used it I went down in spectator mode and I noticed that it was buried. It's not like when it's naturally generated without the "/place" command. I will put screenshots in the issue to show you the difference.

What I expected to happen was...:
The ancient city would generate the same way it would naturally.

What actually happened was...:
The ancient city was generated differently and was buried.

Steps to Reproduce:

1. Type the following into chat: /place structure ancient_city.
2. Go down below Y=0 in spectator mode.
3. Notice that the Ancient city is buried.