### 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)

GDScriptDataType static_var_data_type;
				StringName var_name;
				StringName member_property_setter_function;
				List<const GDScriptParser::SubscriptNode *> chain;
				{
					
					const GDScriptParser::SubscriptNode *n = subscript;
					while (true) {
						chain.push_back(n);
						if (n->base->type != GDScriptParser::Node::SUBSCRIPT) {
							
							if (n->base->type == GDScriptParser::Node::IDENTIFIER) {
								GDScriptParser::IdentifierNode *identifier = static_cast<GDScriptParser::IdentifierNode *>(n->base);
								var_name = identifier->name;
								if (_is_class_member_property(codegen, var_name)) {
									assign_class_member_property = var_name;
								} else if (!_is_local_or_parameter(codegen, var_name)) {
									if (codegen.script->member_indices.has(var_name)) {
										is_member_property = true;
										is_static = false;
										const GDScript::MemberInfo &minfo = codegen.script->member_indices[var_name];
										member_property_setter_function = minfo.setter;
										member_property_has_setter = member_property_setter_function != StringName();
										member_property_is_in_setter = member_property_has_setter && member_property_setter_function == codegen.function_name;
										target_member_property.mode = GDScriptCodeGenerator::Address::MEMBER;
										target_member_property.address = minfo.index;
										target_member_property.type = minfo.data_type;
									} else {
										
										GDScript *scr = codegen.script;