### 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;
				}
			}
		} else {
			valtext = String::num(p_item->cells[p_col].val, Math::range_step_decimals(p_item->cells[p_col].step));
		}
	} else {
		valtext = p_item->cells[p_col].text;
	}
	if (!p_item->cells[p_col].suffix.is_empty()) {
		valtext += " " + p_item->cells[p_col].suffix;
	}
	if (p_item->cells[p_col].text_direction == Control::TEXT_DIRECTION_INHERITED) {
		p_item->cells.write[p_col].text_buf->set_direction(is_layout_rtl() ? TextServer::DIRECTION_RTL : TextServer::DIRECTION_LTR);
	} else {
		p_item->cells.write[p_col].text_buf->set_direction((TextServer::Direction)p_item->cells[p_col].text_direction);
	}
	Ref<Font> font;
	if (p_item->cells[p_col].custom_font.is_valid()) {
		font = p_item->cells[p_col].custom_font;
	} else {
		font = theme_cache.font;
	}
	int font_size;
	if (p_item->cells[p_col].custom_font_size > 0) {
		font_size = p_item->cells[p_col].custom_font_size;
	} else {
		font_size = theme_cache.font_size;
	}
	p_item->cells.write[p_col].text_buf->add_string(valtext, font, font_size, p_item->cells[p_col].language);