In the end almost sure I was missing that object, for an unknown reason, since as I said I don’t have scenery mods, I found this post for the installation to add back missing files.
The steam users have it easier using verify files integrity options.
I lost all the configuration and in the end it turned out it wasn’t my fault, but someone at Asobo came up with the brilliant idea to use an asset from another airport which I didn’t have installed (if I want to save disk space, I don’t plan to fly there, and they give me the option to install airports individually, why wouldn’t I use that option).