### Godot version

master ([06ccbfe](https://github.com/godotengine/godot/commit/06ccbfe8eec6e840db3df2360dc2804386f940b8))

### System information

PopOS 22.04

### Issue description

Sometimes the doc page is broken when the engine is closed and then restarted.
Closing the doc and opening it again fixes it.

![2023-05-27_22-15](https://github.com/godotengine/godot/assets/3624853/ed202a55-03e8-420a-bc1c-ccfc7f7cd02a)


### Steps to reproduce

- Open a documentation page for any node
- Restart Godot

### Minimal reproduction project

NA

EDIT : Added the commit hash @Calinou 
menu->popup();
			grab_focus();
		}
	}
	Ref<InputEventPanGesture> pan_gesture = p_event;
	if (pan_gesture.is_valid()) {
		if (scroll_active) {
			vscroll->set_value(vscroll->get_value() + vscroll->get_page() * pan_gesture->get_delta().y * 0.5 / 8);
		}
		return;
	}
	Ref<InputEventKey> k = p_event;
	if (k.is_valid()) {
		if (k->is_pressed()) {
			bool handled = false;
			if (k->is_action("ui_page_up", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() - vscroll->get_page());
				handled = true;
			}
			if (k->is_action("ui_page_down", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() + vscroll->get_page());
				handled = true;
			}
			if (k->is_action("ui_up", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() - theme_cache.normal_font->get_height(theme_cache.normal_font_size));
				handled = true;
			}
			if (k->is_action("ui_down", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() + theme_cache.normal_font->get_height(theme_cache.normal_font_size));
				handled = true;