### 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)

if (!field->is_static) {
			continue;
		}
		GDScriptDataType field_type = _gdtype_from_datatype(field->get_datatype(), codegen.script);
		if (field_type.has_type) {
			codegen.generator->write_newline(field->start_line);
			if (field_type.has_container_element_type()) {
				GDScriptCodeGenerator::Address temp = codegen.add_temporary(field_type);
				codegen.generator->write_construct_typed_array(temp, field_type.get_container_element_type(), Vector<GDScriptCodeGenerator::Address>());
				codegen.generator->write_set_static_variable(temp, class_addr, p_script->static_variables_indices[field->identifier->name].index);
				codegen.generator->pop_temporary();
			} else if (field_type.kind == GDScriptDataType::BUILTIN) {
				GDScriptCodeGenerator::Address temp = codegen.add_temporary(field_type);
				codegen.generator->write_construct(temp, field_type.builtin_type, Vector<GDScriptCodeGenerator::Address>());
				codegen.generator->write_set_static_variable(temp, class_addr, p_script->static_variables_indices[field->identifier->name].index);
				codegen.generator->pop_temporary();
			}
			
		}
	}
	for (int i = 0; i < p_class->members.size(); i++) {
		
		if (p_class->members[i].type != GDScriptParser::ClassNode::Member::VARIABLE) {
			continue;
		}
		const GDScriptParser::VariableNode *field = p_class->members[i].variable;
		if (!field->is_static) {
			continue;
		}
		if (field->initializer) {