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I have had this happen with two scenes by now. These scenes consist of a large tilemap with multiple layers, a player and thats it. The scenes inherit from a LevelBase class I wrote, but that is so simple. that it can't be the problem. LevelBase just has a open_pause_menu() function and nothing else. Does anyone know why this might be happening?
EDIT: Forgot to translate the message. It says "scene file 'office.tscn' seems to be invalid or faulty."
I'd been having issues with this myself recently. I assume you're in Godot 4.1? I tracked the issue down to being cyclic references in GDScript. As an example from what you've provided, you may have LevelBase referring to the Player script, and then the Player script referring to LevelBase. This only seems to be a problem with the type hinting in GDScript like the following:
var player:PlayerClassRemoving the hinting may fix it. As for the bug, you can read some more on it here: https://github.com/godotengine/godot/issues/80877
As a side note, I've noticed that 4.1 has this issue worse than 4.0. In 4.0 it just unbinds the script from the scene, and allows you to rebind it again. But in 4.1 it causes the error message, making you unable to open the scene.
I'm using the latest Dec build, but it was a problem before that.