### 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)

{
				
				const GDScriptParser::ClassNode *base_class = codegen.class_node;
				while (base_class != nullptr) {
					if (base_class->has_member(identifier)) {
						const GDScriptParser::ClassNode::Member &member = base_class->get_member(identifier);
						if (member.type == GDScriptParser::ClassNode::Member::FUNCTION || member.type == GDScriptParser::ClassNode::Member::SIGNAL) {
							
							GDScriptCodeGenerator::Address temp = codegen.add_temporary(); 
							GDScriptCodeGenerator::Address self(GDScriptCodeGenerator::Address::SELF);
							gen->write_get_named(temp, identifier, self);
							return temp;
						}
					}
					base_class = base_class->base_type.class_type;
				}
				
				GDScript *scr = codegen.script;
				GDScriptNativeClass *nc = nullptr;
				while (scr) {
					if (scr->native.is_valid()) {
						nc = scr->native.ptr();
					}
					scr = scr->_base;
				}
				if (nc && (ClassDB::has_signal(nc->get_name(), identifier) || ClassDB::has_method(nc->get_name(), identifier))) {
					
					GDScriptCodeGenerator::Address temp = codegen.add_temporary(); 
					GDScriptCodeGenerator::Address self(GDScriptCodeGenerator::Address::SELF);
					gen->write_get_named(temp, identifier, self);