### Godot version

4.2 dev1

### System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

### Issue description

Calling `Tree.propagate_check()` after an item is unchecked does not properly uncheck the parents. They are left in partially checked state.

It's easy to observe in theme editor:

https://github.com/godotengine/godot/assets/2223172/71d0479c-0a5e-48d3-957f-d90379a95c22



### Steps to reproduce

1. Edit a Theme resource
2. Go to Manage Items... menu
3. Go to Import Items tab
4. Unfold something
5. Check and uncheck a child checkbox

### Minimal reproduction project

N/A
const Size2 control_size = get_size();
	const Ref<StyleBox> background = theme_cache.panel_style;
	
	const real_t width = control_size.x - background->get_margin(SIDE_LEFT) - background->get_margin(SIDE_RIGHT);
	const real_t height = control_size.y - background->get_margin(SIDE_TOP) - background->get_margin(SIDE_BOTTOM);
	const Rect2 content_rect = Rect2(background->get_offset(), Size2(width, height));
	const Size2 hmin = h_scroll->get_combined_minimum_size();
	const Size2 vmin = v_scroll->get_combined_minimum_size();
	const Size2 internal_min_size = get_internal_min_size();
	const int title_button_height = _get_title_button_height();
	Size2 tree_content_size = content_rect.get_size() - Vector2(0, title_button_height);
	bool display_vscroll = internal_min_size.height > tree_content_size.height;
	bool display_hscroll = internal_min_size.width > tree_content_size.width;
	for (int i = 0; i < 2; i++) {
		
		if (display_hscroll) {
			tree_content_size.height = content_rect.get_size().height - title_button_height - hmin.height;
			display_vscroll = internal_min_size.height > tree_content_size.height;
		}
		if (display_vscroll) {
			tree_content_size.width = content_rect.get_size().width - vmin.width;
			display_hscroll = internal_min_size.width > tree_content_size.width;
		}
	}
	if (display_vscroll) {
		v_scroll->show();
		v_scroll->set_max(internal_min_size.height);
		v_scroll->set_page(tree_content_size.height);
		theme_cache.offset.y = v_scroll->get_value();