3d model of the floor not visible in the environment

[Menste]

Hello, everyone.
I am experiencing a problem with my Spatial project made through Unity.
I created the scene respecting the limitations imposed by spatial.
When I go to test it through the "Test Active Scene" everything works correctly. The problem occurs when I proceed to publish the scene.
Once published I find that the 3d models of the floor (and the rest of the building) are not present. As a result my avatar falls into the void.
Has this ever happened to you? Could you help me understand how to solve the problem?
The first image is the problem in the spatial published environment
The second image is what I see when I test the scene.

Thanks in advance