### 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
TreeItem *current = this;
	if ((!current->collapsed || p_include_invisible) && current->first_child) {
		current = current->first_child;
	} else if (current->next) {
		current = current->next;
	} else {
		while (current && !current->next) {
			current = current->parent;
		}
		if (!current) {
			if (p_wrap) {
				return tree->root;
			} else {
				return nullptr;
			}
		} else {
			current = current->next;
		}
	}
	return current;
}
TreeItem *TreeItem::get_next_visible(bool p_wrap) {