### 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)

func_args.push_back(p_value_addr);
			codegen.generator->write_call_gdscript_utility(value_length_addr, "len", func_args);
			
			temp_type.builtin_type = Variant::BOOL;
			GDScriptCodeGenerator::Address length_compat_addr = codegen.add_temporary(temp_type);
			codegen.generator->write_binary_operator(length_compat_addr, p_pattern->rest_used ? Variant::OP_GREATER_EQUAL : Variant::OP_EQUAL, value_length_addr, dict_length_addr);
			codegen.generator->write_and_right_operand(length_compat_addr);
			
			codegen.generator->write_end_and(result_addr);
			
			codegen.generator->pop_temporary();
			codegen.generator->pop_temporary();
			
			GDScriptCodeGenerator::Address element_addr = codegen.add_temporary();
			GDScriptCodeGenerator::Address element_type_addr = codegen.add_temporary();
			
			for (int i = 0; i < p_pattern->dictionary.size(); i++) {
				const GDScriptParser::PatternNode::Pair &element = p_pattern->dictionary[i];
				if (element.value_pattern && element.value_pattern->pattern_type == GDScriptParser::PatternNode::PT_REST) {
					
					break;
				}
				
				codegen.generator->write_and_left_operand(result_addr);
				
				GDScriptCodeGenerator::Address pattern_key_addr = _parse_expression(codegen, r_error, element.key);
				if (r_error) {
					return GDScriptCodeGenerator::Address();
				}