Object not visible or changed by the sim

Hi everybody! I created a MSFS scenery importing 3d models from Google. Everything worked and I’ve been using it for a couple of months. Now flying over this scenery I just noticed that one of the objects does not appear anymore.

Opened the project in SDK and discovered that the model is there but invisible. Checked all options OK and even erased adjacent polygons to be sure is in a clean space. Anyhow the only moment I can see it (for a milisecond before it goes invisible again) is when pressing “replace model” button in the object properties.

Funny though, If I add a new instance of the same object to the scenery, some different model appears, like a curved piece of the earth planet. Obviously nothing that I imported into the sim.

Anybody experienced something like this?