### 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
ERR_FAIL_INDEX_V(p_column, cells.size(), "");
	return cells[p_column].text;
}
void TreeItem::set_text_direction(int p_column, Control::TextDirection p_text_direction) {
	ERR_FAIL_INDEX(p_column, cells.size());
	ERR_FAIL_COND((int)p_text_direction < -1 || (int)p_text_direction > 3);
	if (cells[p_column].text_direction == p_text_direction) {
		return;
	}
	cells.write[p_column].text_direction = p_text_direction;
	cells.write[p_column].dirty = true;
	_changed_notify(p_column);
	cells.write[p_column].cached_minimum_size_dirty = true;
}
Control::TextDirection TreeItem::get_text_direction(int p_column) const {
	ERR_FAIL_INDEX_V(p_column, cells.size(), Control::TEXT_DIRECTION_INHERITED);
	return cells[p_column].text_direction;
}
void TreeItem::set_autowrap_mode(int p_column, TextServer::AutowrapMode p_mode) {
	ERR_FAIL_INDEX(p_column, cells.size());
	ERR_FAIL_COND(p_mode < TextServer::AUTOWRAP_OFF || p_mode > TextServer::AUTOWRAP_WORD_SMART);
	if (cells[p_column].autowrap_mode == p_mode) {
		return;
	}
	cells.write[p_column].autowrap_mode = p_mode;
	cells.write[p_column].dirty = true;
	_changed_notify(p_column);
	cells.write[p_column].cached_minimum_size_dirty = true;
}
TextServer::AutowrapMode TreeItem::get_autowrap_mode(int p_column) const {