### 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)

is_member = true;
						is_static = false;
						GDScript::MemberInfo &minfo = codegen.script->member_indices[var_name];
						setter_function = minfo.setter;
						has_setter = setter_function != StringName();
						is_in_setter = has_setter && setter_function == codegen.function_name;
						member.mode = GDScriptCodeGenerator::Address::MEMBER;
						member.address = minfo.index;
						member.type = minfo.data_type;
					} else {
						
						GDScript *scr = codegen.script;
						while (scr) {
							if (scr->static_variables_indices.has(var_name)) {
								is_member = true;
								is_static = true;
								GDScript::MemberInfo &minfo = scr->static_variables_indices[var_name];
								setter_function = minfo.setter;
								has_setter = setter_function != StringName();
								is_in_setter = has_setter && setter_function == codegen.function_name;
								static_var_class = codegen.add_constant(scr);
								static_var_index = minfo.index;
								static_var_data_type = minfo.data_type;
								break;
							}
							scr = scr->_base;
						}
					}
				}
				GDScriptCodeGenerator::Address target;