### 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)

style_window_title->set_corner_radius(CORNER_TOP_LEFT, 0);
	style_window_title->set_corner_radius(CORNER_TOP_RIGHT, 0);
	
	style_window_title->set_expand_margin(SIDE_BOTTOM, 2 * EDSCALE);
	Ref<StyleBoxFlat> style_window = style_popup->duplicate();
	style_window->set_border_color(base_color);
	style_window->set_border_width(SIDE_TOP, 24 * EDSCALE);
	style_window->set_expand_margin(SIDE_TOP, 24 * EDSCALE);
	theme->set_stylebox("embedded_border", "Window", style_window);
	theme->set_stylebox("embedded_unfocused_border", "Window", style_window);
	theme->set_color("title_color", "Window", font_color);
	theme->set_icon("close", "Window", theme->get_icon(SNAME("GuiClose"), SNAME("EditorIcons")));
	theme->set_icon("close_pressed", "Window", theme->get_icon(SNAME("GuiClose"), SNAME("EditorIcons")));
	theme->set_constant("close_h_offset", "Window", 22 * EDSCALE);
	theme->set_constant("close_v_offset", "Window", 20 * EDSCALE);
	theme->set_constant("title_height", "Window", 24 * EDSCALE);
	theme->set_constant("resize_margin", "Window", 4 * EDSCALE);
	theme->set_font("title_font", "Window", theme->get_font(SNAME("title"), SNAME("EditorFonts")));
	theme->set_font_size("title_font_size", "Window", theme->get_font_size(SNAME("title_size"), SNAME("EditorFonts")));
	
	Ref<StyleBoxFlat> style_complex_window = style_window->duplicate();
	style_complex_window->set_bg_color(dark_color_2);
	style_complex_window->set_border_color(dark_color_2);
	theme->set_stylebox("panel", "EditorSettingsDialog", style_complex_window);
	theme->set_stylebox("panel", "ProjectSettingsEditor", style_complex_window);
	theme->set_stylebox("panel", "EditorAbout", style_complex_window);
	
	theme->set_stylebox("panel", "AcceptDialog", style_window_title);
	theme->set_constant("buttons_separation", "AcceptDialog", 8 * EDSCALE);