### Godot version

v4.0.1.stable.official [cacf49999]

### System information

Windows 10

### Issue description

If you use Sprite2D with a regular CompressedTexture and set a Region on it, then use a Sprite2D with a CanvasTexture and a different texture in the diffuse, and try to set a Region, the Region Editor display will show the texture from the first sprite2D node. I would expect it to show the diffuse texture from the current Sprite2D.
![image](https://user-images.githubusercontent.com/7292421/231493673-4eb152e0-81ed-4248-8465-71242c291cd2.png)
![image](https://user-images.githubusercontent.com/7292421/231493749-6173993b-e77c-4899-961e-9a055c07e351.png)




### Steps to reproduce

Make a sprite2D node
add a texture to it 
set Region to Enabled
click Edit Region under 'Region'
set any region

Make another sprite2D node
add a CanvasTexture to it
add a different texture to the Diffuse part
set Region to Enabled
click Edit Region under 'Region'
see wrong texture

### Minimal reproduction project

[RegionEditorBug.zip](https://github.com/godotengine/godot/files/11212626/RegionEditorBug.zip)

if (!atlas.is_valid()) {
		return true;
	}
	int x = p_x + region.position.x - margin.position.x;
	int y = p_y + region.position.y - margin.position.y;
	
	if (x < 0 || x >= atlas->get_width()) {
		return false;
	}
	if (y < 0 || y >= atlas->get_height()) {
		return false;
	}
	return atlas->is_pixel_opaque(x, y);
}
Ref<Image> AtlasTexture::get_image() const {
	if (!atlas.is_valid() || !atlas->get_image().is_valid()) {
		return Ref<Image>();
	}
	return atlas->get_image()->get_region(region);
}
AtlasTexture::AtlasTexture() {}