### 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
tool_button = p_tool_button;
}
void EditorLog::register_undo_redo(UndoRedo *p_undo_redo) {
	p_undo_redo->set_commit_notify_callback(_undo_redo_cbk, this);
}
void EditorLog::_undo_redo_cbk(void *p_self, const String &p_name) {
	EditorLog *self = static_cast<EditorLog *>(p_self);
	self->add_message(p_name, EditorLog::MSG_TYPE_EDITOR);
}
void EditorLog::_rebuild_log() {
	log->clear();
	for (int msg_idx = 0; msg_idx < messages.size(); msg_idx++) {
		LogMessage msg = messages[msg_idx];
		if (collapse) {
			
			_add_log_line(msg);
		} else {
			
			for (int i = 0; i < msg.count; i++) {
				_add_log_line(msg);
			}
		}
	}
}
void EditorLog::_add_log_line(LogMessage &p_message, bool p_replace_previous) {