### 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
ADD_SIGNAL(MethodInfo("button_clicked", PropertyInfo(Variant::OBJECT, "item", PROPERTY_HINT_RESOURCE_TYPE, "TreeItem"), PropertyInfo(Variant::INT, "column"), PropertyInfo(Variant::INT, "id"), PropertyInfo(Variant::INT, "mouse_button_index")));
	ADD_SIGNAL(MethodInfo("custom_popup_edited", PropertyInfo(Variant::BOOL, "arrow_clicked")));
	ADD_SIGNAL(MethodInfo("item_activated"));
	ADD_SIGNAL(MethodInfo("column_title_clicked", PropertyInfo(Variant::INT, "column"), PropertyInfo(Variant::INT, "mouse_button_index")));
	ADD_SIGNAL(MethodInfo("nothing_selected"));
	BIND_ENUM_CONSTANT(SELECT_SINGLE);
	BIND_ENUM_CONSTANT(SELECT_ROW);
	BIND_ENUM_CONSTANT(SELECT_MULTI);
	BIND_ENUM_CONSTANT(DROP_MODE_DISABLED);
	BIND_ENUM_CONSTANT(DROP_MODE_ON_ITEM);
	BIND_ENUM_CONSTANT(DROP_MODE_INBETWEEN);
}
Tree::Tree() {
	columns.resize(1);
	set_focus_mode(FOCUS_ALL);
	popup_menu = memnew(PopupMenu);
	popup_menu->hide();
	add_child(popup_menu, false, INTERNAL_MODE_FRONT);
	popup_editor = memnew(Popup);
	add_child(popup_editor, false, INTERNAL_MODE_FRONT);
	popup_editor_vb = memnew(VBoxContainer);
	popup_editor_vb->add_theme_constant_override("separation", 0);
	popup_editor_vb->set_anchors_and_offsets_preset(PRESET_FULL_RECT);
	popup_editor->add_child(popup_editor_vb);
	line_editor = memnew(LineEdit);
	line_editor->set_v_size_flags(SIZE_EXPAND_FILL);
	line_editor->hide();
	popup_editor_vb->add_child(line_editor);
	text_editor = memnew(TextEdit);
	text_editor->set_v_size_flags(SIZE_EXPAND_FILL);