### 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("color_picker_button_height", "Editor", 28 * EDSCALE);
	theme->set_constant("gizmo_handle_scale", "Editor", gizmo_handle_scale);
	theme->set_constant("window_border_margin", "Editor", 8);
	theme->set_constant("top_bar_separation", "Editor", 8 * EDSCALE);
	
	
	
	bool keep_old_icons = false;
	bool regenerate_thumb_icons = true;
	if (p_theme != nullptr) {
		
		
		
		const float prev_scale = (float)p_theme->get_constant(SNAME("scale"), SNAME("Editor"));
		const bool prev_dark_theme = (bool)p_theme->get_constant(SNAME("dark_theme"), SNAME("Editor"));
		const Color prev_accent_color = p_theme->get_color(SNAME("accent_color"), SNAME("Editor"));
		const float prev_icon_saturation = p_theme->get_color(SNAME("icon_saturation"), SNAME("Editor")).r;
		const float prev_gizmo_handle_scale = (float)p_theme->get_constant(SNAME("gizmo_handle_scale"), SNAME("Editor"));
		keep_old_icons = (Math::is_equal_approx(prev_scale, EDSCALE) &&
				Math::is_equal_approx(prev_gizmo_handle_scale, gizmo_handle_scale) &&
				prev_dark_theme == dark_theme &&
				prev_accent_color == accent_color &&
				prev_icon_saturation == icon_saturation);
		const double prev_thumb_size = (double)p_theme->get_constant(SNAME("thumb_size"), SNAME("Editor"));
		regenerate_thumb_icons = !Math::is_equal_approx(prev_thumb_size, thumb_size);
	}
#ifndef MODULE_SVG_ENABLED
	WARN_PRINT("SVG support disabled, editor icons won't be rendered.");
#endif
	if (keep_old_icons) {