### 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)

TreeItem *current = this;
	if ((!current->collapsed || p_include_invisible) && current->first_child) {
		current = current->first_child;
	} else if (current->next) {
		current = current->next;
	} else {
		while (current && !current->next) {
			current = current->parent;
		}
		if (!current) {
			if (p_wrap) {
				return tree->root;
			} else {
				return nullptr;
			}
		} else {
			current = current->next;
		}
	}
	return current;
}
TreeItem *TreeItem::get_next_visible(bool p_wrap) {