### Godot version

4.2.dev1

### System information

Manjaro Linux (DE: Cinnamon v5.8.4) 64 bits

### Issue description

The title already explains it. Take a look at the steps to reproduce below.

### Steps to reproduce

In a GDScript `_ready()` function write this:
```print_rich("[color=red]Red line\n2nd red line[/color]")```

the second line is not red and the output is as follow:
![Capture d’écran du 2023-07-29 05-50-16](https://github.com/godotengine/godot/assets/102065761/554038c6-d128-40c9-8c88-237b44b35b12)

I tested all the the possible BBCodes for the print_rich() method (as stated in the documentation), and of course they all failed.

The RichTextLabel in my projects works as expected.

### Minimal reproduction project

N/A
Ref<ConfigFile> config;
	config.instantiate();
	
	config->load(EditorPaths::get_singleton()->get_project_settings_dir().path_join("editor_layout.cfg"));
	const String section = "editor_log";
	for (const KeyValue<MessageType, LogFilter *> &E : type_filter_map) {
		config->set_value(section, "log_filter_" + itos(E.key), E.value->is_active());
	}
	config->set_value(section, "collapse", collapse);
	config->set_value(section, "show_search", search_box->is_visible());
	config->save(EditorPaths::get_singleton()->get_project_settings_dir().path_join("editor_layout.cfg"));
}
void EditorLog::_load_state() {
	is_loading_state = true;
	Ref<ConfigFile> config;
	config.instantiate();
	config->load(EditorPaths::get_singleton()->get_project_settings_dir().path_join("editor_layout.cfg"));
	
	const String section = "editor_log";
	for (const KeyValue<MessageType, LogFilter *> &E : type_filter_map) {
		E.value->set_active(config->get_value(section, "log_filter_" + itos(E.key), true));
	}
	collapse = config->get_value(section, "collapse", false);
	collapse_button->set_pressed(collapse);
	bool show_search = config->get_value(section, "show_search", true);
	search_box->set_visible(show_search);
	show_search_button->set_pressed(show_search);
	is_loading_state = false;
}
void EditorLog::_clear_request() {