### Godot version

v4.2.dev3.official [013e8e3af]

### System information

Godot v4.2.dev3 - macOS 13.4.1 - Vulkan (Forward+) - integrated Apple M1 - Apple M1 (8 Threads)

### Issue description

The content is empty. In the list `<Select Importer> `should be preselected, if possible. 
Or directly show the settings for "Animation Library" (check first selection).


![Bildschirmfoto 2023-08-22 um 01 29 44](https://github.com/godotengine/godot/assets/41921395/8300a756-ff54-4310-a0ad-04ad9525aeb9)


### Steps to reproduce

1. Project
2. Project Settings
3. Import Defaults 

https://github.com/godotengine/godot/assets/41921395/cb263c7d-27f0-4053-a555-0ed03ac7ef2a



### Minimal reproduction project

N/A
GDCLASS(ImportDefaultsEditorSettings, Object)
	friend class ImportDefaultsEditor;
	List<PropertyInfo> properties;
	HashMap<StringName, Variant> values;
	HashMap<StringName, Variant> default_values;
	Ref<ResourceImporter> importer;
protected:
	bool _set(const StringName &p_name, const Variant &p_value) {
		if (values.has(p_name)) {
			values[p_name] = p_value;
			return true;
		} else {
			return false;
		}
	}
	bool _get(const StringName &p_name, Variant &r_ret) const {
		if (values.has(p_name)) {
			r_ret = values[p_name];
			return true;
		} else {
			r_ret = Variant();
			return false;
		}
	}
	void _get_property_list(List<PropertyInfo> *p_list) const {