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:PlayerClass
Removing 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 really like my Braton and Lex incarnons. They are my go to weapons now.
Beat it on Losing Is Fun difficulty, took a good 21 in game years, and ~3.5 days IRL play time, 107 Raids, and 178 major threats.
Was it worth it? I don't know, but I won't be doing it again...
Also ignore the early wealth drop, we don't talk about the early wealth drop...
Seems to be comparing the waterfalls.