### 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 (!root) {
		return nullptr;
	}
	while (true) {
		if (!p_item) {
			p_item = root;
		} else {
			if (p_item->first_child) {
				p_item = p_item->first_child;
			} else if (p_item->next) {
				p_item = p_item->next;
			} else {
				while (!p_item->next) {
					p_item = p_item->parent;
					if (p_item == nullptr) {
						return nullptr;
					}
				}
				p_item = p_item->next;
			}
		}
		for (int i = 0; i < columns.size(); i++) {
			if (p_item->cells[i].selected) {
				return p_item;
			}
		}
	}
	return nullptr;
}
int Tree::get_column_minimum_width(int p_column) const {