### Godot version

4.1.0

### System information

Windows 10, i711800H, Forward+ Vulkan

### Issue description

When using @export_group("Name") in a BaseClass, then inheriting from that BaseClass in another class and there also using @export_group("Name"), with the same group name, then running the project and re-saving the inherited class the project crashes with 
```
ERROR: FATAL: Index p_index = 3 is out of bounds (size() = 3).
   at: get (./core/templates/cowdata.h:155)
```

sometimes the editor crashes too after a while.

### Steps to reproduce

1. open reproduction project
2. Run the project.
3. Open the "super"script
4. Press CTRL + S to save it.

### Minimal reproduction project

[MRP_.zip](https://github.com/godotengine/godot/files/12137412/MRP_.zip)

for (int i = 0; i < p_class->members.size(); i++) {
		const GDScriptParser::ClassNode::Member &member = p_class->members[i];
		if (member.type == member.FUNCTION) {
			const GDScriptParser::FunctionNode *function = member.function;
			Error err = OK;
			_parse_function(err, p_script, p_class, function);
			if (err) {
				return err;
			}
		} else if (member.type == member.VARIABLE) {
			const GDScriptParser::VariableNode *variable = member.variable;
			if (variable->property == GDScriptParser::VariableNode::PROP_INLINE) {
				if (variable->setter != nullptr) {
					Error err = _parse_setter_getter(p_script, p_class, variable, true);
					if (err) {
						return err;
					}
				}