### Godot version

v3.5.1.stable.official [6fed1ffa3]

### System information

Steam OS, Steam Deck

### Issue description

Calling `tween_callback` where the first (object) parameter is a `Reference` doesn't work as I expected.  The code compiles and runs without producing any errors, but the callback function is never executed.

### Steps to reproduce

Running the minimal reproduction project demonstrates the issue.  The code pattern is quite simple:

**ReferenceType.gd**
```gdscript
extends Reference

func foo():
	print("foo was called")
```

**Test.gd**
```gdscript
extends Node2D

func _ready():
	var ref := preload("ReferenceType.gd").new()
	var tween := create_tween()
	tween.tween_interval(1)
	tween.tween_callback(ref, "foo")
```

I suspect that the issue is somehow related to reference-counting, and that `SceneTreeTween` is not updating the object's reference count.  I can get the behavior I expect by modifying the code to call `reference()` and `unreference()` manually, as shown below:

```gdscript
	var ref := preload("ReferenceType.gd").new()
	ref.reference()
	
	var tween := create_tween()
	tween.tween_interval(1)
	tween.tween_callback(ref, "foo")
	tween.tween_callback(ref, "unreference")
```

The documentation strongly recommends against calling these functions "unless you know what you're doing", so it feels like `SceneTreeTween` should handle this.  If this is expected behavior, it would be nice if the `SceneTreeTween` documentation urged caution when using `Reference`. 

### Minimal reproduction project

[ReferenceTween.zip](https://github.com/godotengine/godot/files/10328012/ReferenceTween.zip)

GDCLASS(MethodTweener, Tweener);
public:
	Ref<MethodTweener> set_trans(Tween::TransitionType p_trans);
	Ref<MethodTweener> set_ease(Tween::EaseType p_ease);
	Ref<MethodTweener> set_delay(double p_delay);
	void set_tween(Ref<Tween> p_tween) override;
	void start() override;
	bool step(double &r_delta) override;
	MethodTweener(Callable p_callback, Variant p_from, Variant p_to, double p_duration);
	MethodTweener();
protected:
	static void _bind_methods();
private:
	double duration = 0;
	double delay = 0;
	Tween::TransitionType trans_type = Tween::TRANS_MAX;
	Tween::EaseType ease_type = Tween::EASE_MAX;
	Ref<Tween> tween;
	Variant initial_val;
	Variant delta_val;
	Variant final_val;
	Callable callback;
};
#endif