### Godot version

v4.0.1.stable.official [cacf49999]

### System information

Windows 10

### Issue description

If you use Sprite2D with a regular CompressedTexture and set a Region on it, then use a Sprite2D with a CanvasTexture and a different texture in the diffuse, and try to set a Region, the Region Editor display will show the texture from the first sprite2D node. I would expect it to show the diffuse texture from the current Sprite2D.
![image](https://user-images.githubusercontent.com/7292421/231493673-4eb152e0-81ed-4248-8465-71242c291cd2.png)
![image](https://user-images.githubusercontent.com/7292421/231493749-6173993b-e77c-4899-961e-9a055c07e351.png)




### Steps to reproduce

Make a sprite2D node
add a texture to it 
set Region to Enabled
click Edit Region under 'Region'
set any region

Make another sprite2D node
add a CanvasTexture to it
add a different texture to the Diffuse part
set Region to Enabled
click Edit Region under 'Region'
see wrong texture

### Minimal reproduction project

[RegionEditorBug.zip](https://github.com/godotengine/godot/files/11212626/RegionEditorBug.zip)

OS::get_singleton()->benchmark_begin_measure("create_custom_theme");
	Ref<Theme> theme = create_editor_theme(p_theme);
	const String custom_theme_path = EDITOR_GET("interface/theme/custom_theme");
	if (!custom_theme_path.is_empty()) {
		Ref<Theme> custom_theme = ResourceLoader::load(custom_theme_path);
		if (custom_theme.is_valid()) {
			theme->merge_with(custom_theme);
		}
	}
	OS::get_singleton()->benchmark_end_measure("create_custom_theme");
	return theme;
}
/**
 * Returns the SVG code for the default project icon.
 */
String get_default_project_icon() {
	for (int i = 0; i < editor_icons_count; i++) {
		if (strcmp(editor_icons_names[i], "DefaultProjectIcon") == 0) {
			return String(editor_icons_sources[i]);
		}
	}
	return String();
}