### 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)

struct ChainInfo {
					bool is_named = false;
					GDScriptCodeGenerator::Address base;
					GDScriptCodeGenerator::Address key;
					StringName name;
				};
				List<ChainInfo> set_chain;
				for (List<const GDScriptParser::SubscriptNode *>::Element *E = chain.back(); E; E = E->prev()) {
					if (E == chain.front()) {
						
						break;
					}
					const GDScriptParser::SubscriptNode *subscript_elem = E->get();
					GDScriptCodeGenerator::Address value = codegen.add_temporary(_gdtype_from_datatype(subscript_elem->get_datatype(), codegen.script));
					GDScriptCodeGenerator::Address key;
					StringName name;
					if (subscript_elem->is_attribute) {
						name = subscript_elem->attribute->name;
						gen->write_get_named(value, name, prev_base);
					} else {
						key = _parse_expression(codegen, r_error, subscript_elem->index);
						if (r_error) {
							return GDScriptCodeGenerator::Address();
						}
						gen->write_get(value, key, prev_base);
					}
					
					set_chain.push_front({ subscript_elem->is_attribute, prev_base, key, name }); 
					prev_base = value;
				}