### Godot version

4.0beta17

### System information

Linux Mint 21.1

### Issue description

When editing animations for the **frame** property of **Sprite2D**, the preview image does not respect the **region_rect** specified in the Sprite2D's properties.

Godot 4.0 (tested with alpha1 to beta17)
![Screenshot from 2023-02-05 21-19-29](https://user-images.githubusercontent.com/2348534/216868394-45a9dc42-ce4b-4b11-82cb-4491aea46d9b.png)

Godot 3.5
![Screenshot from 2023-02-05 21-19-43](https://user-images.githubusercontent.com/2348534/216868543-cff6eb60-a431-4138-8fa6-5c30a54de0e1.png)

As can be seen in the second screenshot, the region rect is applied to the key preview image in Godot 3.5, but is ignored in Godot 4.0.


### Steps to reproduce

Steps:

1. Set a region rect on a Sprite2D node
2. Add Sprite2D.frame as a track to an AnimationPlayer
3. Insert key
4. Key preview does not take region rect into account

### Minimal reproduction project

[MRP.zip](https://github.com/godotengine/godot/files/10637055/MRP.zip)

sprite->set_as_coords();
		sprite->set_node(p_object);
		return sprite;
	}
	if (p_property == "current_animation" && (p_object->is_class("AnimationPlayer"))) {
		AnimationTrackEditSubAnim *player = memnew(AnimationTrackEditSubAnim);
		player->set_node(p_object);
		return player;
	}
	if (p_property == "volume_db") {
		AnimationTrackEditVolumeDB *vu = memnew(AnimationTrackEditVolumeDB);
		return vu;
	}
	if (p_type == Variant::BOOL) {
		return memnew(AnimationTrackEditBool);
	}
	if (p_type == Variant::COLOR) {
		return memnew(AnimationTrackEditColor);
	}
	return nullptr;
}
AnimationTrackEdit *AnimationTrackEditDefaultPlugin::create_audio_track_edit() {
	return memnew(AnimationTrackEditTypeAudio);
}
AnimationTrackEdit *AnimationTrackEditDefaultPlugin::create_animation_track_edit(Object *p_object) {
	AnimationTrackEditTypeAnimation *an = memnew(AnimationTrackEditTypeAnimation);
	an->set_node(p_object);
	return an;
}