### Godot version

v4.0.beta.custom_build [fab9926a9]

### System information

Fedora 37

### Issue description

When creating a new inherited scene, saving the scene (for example with Ctrl+S) defaults to overwriting the scene being inherited, instead of prompting for a location to save to.

### Steps to reproduce

1. Create a new inherited scene
2. Press Ctrl+S

If the scene being inherited is imported (for example from a glTF), an error displays. If the inherited scene is a .tscn or .scn, it gets overridden by an inherited scene that tries to inherit itself, which is impossible and thus corrupt.

### Minimal reproduction project

N/A
if (!bool(EDITOR_GET("interface/scene_tabs/show_thumbnail_on_hover"))) {
		return;
	}
	int current_tab = scene_tabs->get_current_tab();
	if (p_tab == current_tab || p_tab < 0) {
		tab_preview_panel->hide();
	} else {
		String path = editor_data.get_scene_path(p_tab);
		if (!path.is_empty()) {
			EditorResourcePreview::get_singleton()->queue_resource_preview(path, this, "_thumbnail_done", p_tab);
		}
	}
}
void EditorNode::_scene_tab_exit() {