### Godot version

4.2 Stable

### System information

Linux

### Issue description

Calling TreeItem set_text() on a TreeItem that was removed via remove_child() causes debugging to end and the application to close without any error message.

### Steps to reproduce

Run the included example to get the debugger to crash. Comment out "treeItem.remove_child(subTreeItem)" for normal behaviour. 

### Minimal reproduction project

[treeItemCrash.zip](https://github.com/godotengine/godot/files/13534005/treeItemCrash.zip)

break;
					}
					Ref<Texture2D> downarrow = theme_cache.select_arrow;
					Rect2i ir = item_rect;
					Point2i arrow_pos = item_rect.position;
					arrow_pos.x += item_rect.size.x - downarrow->get_width();
					arrow_pos.y += Math::floor(((item_rect.size.y - downarrow->get_height())) / 2.0);
					ir.size.width -= downarrow->get_width();
					if (p_item->cells[i].custom_button) {
						if (cache.hover_item == p_item && cache.hover_cell == i) {
							if (Input::get_singleton()->is_mouse_button_pressed(MouseButton::LEFT)) {
								draw_style_box(theme_cache.custom_button_pressed, ir);
							} else {
								draw_style_box(theme_cache.custom_button_hover, ir);
								cell_color = theme_cache.custom_button_font_highlight;
							}
						} else {
							draw_style_box(theme_cache.custom_button, ir);
						}
						ir.size -= theme_cache.custom_button->get_minimum_size();
						ir.position += theme_cache.custom_button->get_offset();
					}
					draw_item_rect(p_item->cells.write[i], ir, cell_color, icon_col, outline_size, font_outline_color);
					downarrow->draw(ci, arrow_pos);
				} break;
			}
			for (int j = p_item->cells[i].buttons.size() - 1; j >= 0; j--) {
				Ref<Texture2D> button_texture = p_item->cells[i].buttons[j].texture;
				Size2 button_size = button_texture->get_size() + theme_cache.button_pressed->get_minimum_size();
				Point2i button_ofs = Point2i(ofs + item_width_with_buttons - button_size.width, p_pos.y) - theme_cache.offset + p_draw_ofs;