### 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
} else {
		log->add_text(p_message.text);
	}
	log->pop_all(); 
	log->add_newline();
	if (p_replace_previous) {
		
		if (log->get_pending_paragraphs() < 100) {
			while (!log->is_ready()) {
				::OS::get_singleton()->delay_usec(1);
			}
		}
	}
}
void EditorLog::_set_filter_active(bool p_active, MessageType p_message_type) {
	type_filter_map[p_message_type]->set_active(p_active);
	_start_state_save_timer();
	_rebuild_log();
}
void EditorLog::_set_search_visible(bool p_visible) {
	search_box->set_visible(p_visible);
	if (p_visible) {
		search_box->grab_focus();
	}
	_start_state_save_timer();
}
void EditorLog::_search_changed(const String &p_text) {
	_rebuild_log();
}
void EditorLog::_reset_message_counts() {