### 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
item_width = MAX(buttons_width, p_draw_size.width - total_ofs);
				}
			}
			int item_width_with_buttons = item_width; 
			int buttons_width = 0;
			for (int j = p_item->cells[i].buttons.size() - 1; j >= 0; j--) {
				Ref<Texture2D> button_texture = p_item->cells[i].buttons[j].texture;
				Size2 button_size = button_texture->get_size() + theme_cache.button_pressed->get_minimum_size();
				item_width -= button_size.width + theme_cache.button_margin;
				buttons_width += button_size.width + theme_cache.button_margin;
			}
			p_item->cells.write[i].text_buf->set_width(item_width);
			label_h = compute_item_height(p_item);
			if (r_self_height != nullptr) {
				*r_self_height = label_h;
			}
			label_h += theme_cache.v_separation;
			Rect2i item_rect = Rect2i(Point2i(ofs, p_pos.y) - theme_cache.offset + p_draw_ofs, Size2i(item_width, label_h));
			Rect2i cell_rect = item_rect;
			if (i != 0) {
				cell_rect.position.x -= theme_cache.h_separation;
				cell_rect.size.x += theme_cache.h_separation;
			}
			if (theme_cache.draw_guides) {
				Rect2 r = cell_rect;
				if (rtl) {
					r.position.x = get_size().width - r.position.x - r.size.x;
				}
				RenderingServer::get_singleton()->canvas_item_add_line(ci, Point2i(r.position.x, r.position.y + r.size.height), r.position + r.size, theme_cache.guide_color, 1);
			}