### 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)

if (it != drop_mode_over) {
						drop_mode_over = it;
						queue_redraw();
					}
					if (it && section != drop_mode_section) {
						drop_mode_section = section;
						queue_redraw();
					}
				}
				cache.hover_item = it;
				cache.hover_cell = col;
				if (it != old_it || col != old_col) {
					if (old_it && old_col >= old_it->cells.size()) {
						
						queue_redraw();
					} else {
						
						bool was_over_button = old_it && old_it->cells[old_col].custom_button;
						bool is_over_button = it && it->cells[col].custom_button;
						if (was_over_button || is_over_button) {
							queue_redraw();
						}
					}
				}
			}
		}
		
		if (cache.hover_type != old_hover || cache.hover_index != old_index) {
			queue_redraw();
		}