### Godot version

4.0.beta10.mono.official

### System information

Windows 11

### Issue description

After registering a C# Script with Autoload and trying to connect to a signal using the `Signal.connect` method (`Singleton.Signal.connect(xxx)`) fails with `Invalid get index 'Signal' (on base: 'Node (Singleton.cs)'). But with `Object.connect` it works.

### Steps to reproduce

- Create a C# class script with a Signal named `Signal` (could be any other).
- Register it with Autoload with the name `Singleton` (could be any other).
- Create a GDScript script and try to connect the Singleton's signal using `Singleton.Signal.connect(xxx)`
- When running the project it fails with `Invalid get index 'Sample' (on base: 'Node (Singleton.cs)').`

### Minimal reproduction project

[example.zip](https://github.com/godotengine/godot/files/10414500/example.zip)

for (const MethodInterface &imethod : p_itype.methods) {
		if (imethod.is_virtual) {
			continue;
		}
		const TypeInterface *return_type = _get_type_or_null(imethod.return_type);
		ERR_FAIL_NULL_V(return_type, ERR_BUG); 
		String im_unique_sig = get_ret_unique_sig(return_type) + ",CallMethodBind";
		if (!imethod.is_static) {
			im_unique_sig += ",CallInstance";
		}
		
		for (const ArgumentInterface &iarg : imethod.arguments) {
			const TypeInterface *arg_type = _get_type_or_null(iarg.type);