### 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)

theme->set_constant("separation", "HSplitContainer", default_margin_size * 2 * EDSCALE);
	theme->set_constant("separation", "VSplitContainer", default_margin_size * 2 * EDSCALE);
	theme->set_constant("minimum_grab_thickness", "SplitContainer", 6 * EDSCALE);
	theme->set_constant("minimum_grab_thickness", "HSplitContainer", 6 * EDSCALE);
	theme->set_constant("minimum_grab_thickness", "VSplitContainer", 6 * EDSCALE);
	
	theme->set_constant("separation", "BoxContainer", default_margin_size * EDSCALE);
	theme->set_constant("separation", "HBoxContainer", default_margin_size * EDSCALE);
	theme->set_constant("separation", "VBoxContainer", default_margin_size * EDSCALE);
	theme->set_constant("margin_left", "MarginContainer", 0);
	theme->set_constant("margin_top", "MarginContainer", 0);
	theme->set_constant("margin_right", "MarginContainer", 0);
	theme->set_constant("margin_bottom", "MarginContainer", 0);
	theme->set_constant("h_separation", "GridContainer", default_margin_size * EDSCALE);
	theme->set_constant("v_separation", "GridContainer", default_margin_size * EDSCALE);
	theme->set_constant("h_separation", "FlowContainer", default_margin_size * EDSCALE);
	theme->set_constant("v_separation", "FlowContainer", default_margin_size * EDSCALE);
	theme->set_constant("h_separation", "HFlowContainer", default_margin_size * EDSCALE);
	theme->set_constant("v_separation", "HFlowContainer", default_margin_size * EDSCALE);
	theme->set_constant("h_separation", "VFlowContainer", default_margin_size * EDSCALE);
	theme->set_constant("v_separation", "VFlowContainer", default_margin_size * EDSCALE);
	
	theme->set_type_variation("MarginContainer4px", "MarginContainer");
	theme->set_constant("margin_left", "MarginContainer4px", 4 * EDSCALE);
	theme->set_constant("margin_top", "MarginContainer4px", 4 * EDSCALE);
	theme->set_constant("margin_right", "MarginContainer4px", 4 * EDSCALE);
	theme->set_constant("margin_bottom", "MarginContainer4px", 4 * EDSCALE);
	
	
	Ref<StyleBoxFlat> style_window_title = style_default->duplicate();