### 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)

assigned = op_result;
				}
				
				if (subscript->is_attribute) {
					gen->write_set_named(prev_base, name, assigned);
				} else {
					gen->write_set(prev_base, key, assigned);
				}
				if (key.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
					gen->pop_temporary();
				}
				if (assigned.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
					gen->pop_temporary();
				}
				assigned = prev_base;
				
				for (const ChainInfo &info : set_chain) {
					bool known_type = assigned.type.has_type;
					bool is_shared = Variant::is_type_shared(assigned.type.builtin_type);
					if (!known_type || !is_shared) {
						if (!known_type) {
							
							gen->write_jump_if_shared(assigned);
						}
						if (!info.is_named) {
							gen->write_set(info.base, info.key, assigned);
						} else {
							gen->write_set_named(info.base, info.name, assigned);
						}
						if (!known_type) {