### 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)

gen->write_call_self(temp, codegen.script->member_indices[identifier].getter, args);
						return temp;
					} else {
						
						int idx = codegen.script->member_indices[identifier].index;
						return GDScriptCodeGenerator::Address(GDScriptCodeGenerator::Address::MEMBER, idx, codegen.script->get_member_type(identifier));
					}
				}
			}
			
			{
				GDScript *scr = codegen.script;
				while (scr) {
					if (scr->static_variables_indices.has(identifier)) {
						if (scr->static_variables_indices[identifier].getter != StringName() && scr->static_variables_indices[identifier].getter != codegen.function_name) {
							
							GDScriptCodeGenerator::Address temp = codegen.add_temporary(scr->static_variables_indices[identifier].data_type);
							GDScriptCodeGenerator::Address class_addr(GDScriptCodeGenerator::Address::CLASS);
							Vector<GDScriptCodeGenerator::Address> args; 
							gen->write_call(temp, class_addr, scr->static_variables_indices[identifier].getter, args);
							return temp;
						} else {
							
							GDScriptCodeGenerator::Address temp = codegen.add_temporary(scr->static_variables_indices[identifier].data_type);
							GDScriptCodeGenerator::Address _class = codegen.add_constant(scr);
							int index = scr->static_variables_indices[identifier].index;
							gen->write_get_static_variable(temp, _class, index);
							return temp;
						}
					}