### 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 (root) {
		Point2 pos = p_pos;
		pos -= theme_cache.panel_style->get_offset();
		pos.y -= _get_title_button_height();
		if (pos.y < 0) {
			return -1;
		}
		if (h_scroll->is_visible_in_tree()) {
			pos.x += h_scroll->get_value();
		}
		if (v_scroll->is_visible_in_tree()) {
			pos.y += v_scroll->get_value();
		}
		int col, h, section;
		TreeItem *it = _find_item_at_pos(root, pos, col, h, section);
		if (it) {
			const TreeItem::Cell &c = it->cells[col];
			int col_width = get_column_width(col);