### 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
if (_scroll(false, mb->get_factor() / 8)) {
					accept_event();
				}
			} break;
			case MouseButton::WHEEL_LEFT: {
				if (_scroll(true, -mb->get_factor() / 8)) {
					accept_event();
				}
			} break;
			case MouseButton::WHEEL_RIGHT: {
				if (_scroll(true, mb->get_factor() / 8)) {
					accept_event();
				}
			} break;
			default:
				break;
		}
	}
	Ref<InputEventPanGesture> pan_gesture = p_event;
	if (pan_gesture.is_valid()) {
		double prev_v = v_scroll->get_value();
		v_scroll->set_value(v_scroll->get_value() + v_scroll->get_page() * pan_gesture->get_delta().y / 8);
		double prev_h = h_scroll->get_value();
		if (is_layout_rtl()) {
			h_scroll->set_value(h_scroll->get_value() + h_scroll->get_page() * -pan_gesture->get_delta().x / 8);
		} else {
			h_scroll->set_value(h_scroll->get_value() + h_scroll->get_page() * pan_gesture->get_delta().x / 8);
		}
		if (v_scroll->get_value() != prev_v || h_scroll->get_value() != prev_h) {
			accept_event();