### 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 (is_member) {
					target = member; 
				} else {
					target = _parse_expression(codegen, r_error, assignment->assignee);
					if (r_error) {
						return GDScriptCodeGenerator::Address();
					}
				}
				GDScriptCodeGenerator::Address assigned_value = _parse_expression(codegen, r_error, assignment->assigned_value);
				if (r_error) {
					return GDScriptCodeGenerator::Address();
				}
				GDScriptCodeGenerator::Address to_assign;
				bool has_operation = assignment->operation != GDScriptParser::AssignmentNode::OP_NONE;
				if (has_operation) {
					
					GDScriptCodeGenerator::Address op_result = codegen.add_temporary(_gdtype_from_datatype(assignment->get_datatype(), codegen.script));
					GDScriptCodeGenerator::Address og_value = _parse_expression(codegen, r_error, assignment->assignee);
					gen->write_binary_operator(op_result, assignment->variant_op, og_value, assigned_value);
					to_assign = op_result;
					if (og_value.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
						gen->pop_temporary();
					}
				} else {
					to_assign = assigned_value;
				}
				if (has_setter && !is_in_setter) {
					
					Vector<GDScriptCodeGenerator::Address> args;
					args.push_back(to_assign);