### 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_tab_base->set_content_margin(SIDE_TOP, widget_default_margin.y);
	Ref<StyleBoxFlat> style_tab_selected = style_tab_base->duplicate();
	style_tab_selected->set_bg_color(base_color);
	
	style_tab_selected->set_border_width(SIDE_TOP, Math::round(2 * EDSCALE));
	
	Color tab_highlight = dark_color_2.lerp(accent_color, 0.75);
	style_tab_selected->set_border_color(tab_highlight);
	style_tab_selected->set_corner_radius_all(0);
	Ref<StyleBoxFlat> style_tab_hovered = style_tab_base->duplicate();
	style_tab_hovered->set_bg_color(dark_color_1.lerp(base_color, 0.4));
	
	style_tab_hovered->set_corner_radius_all(0);
	Ref<StyleBoxFlat> style_tab_unselected = style_tab_base->duplicate();
	style_tab_unselected->set_expand_margin(SIDE_BOTTOM, 0);
	style_tab_unselected->set_bg_color(dark_color_1);
	
	style_tab_unselected->set_border_color(Color(0, 0, 0, 0));
	Ref<StyleBoxFlat> style_tab_disabled = style_tab_base->duplicate();
	style_tab_disabled->set_expand_margin(SIDE_BOTTOM, 0);
	style_tab_disabled->set_bg_color(disabled_bg_color);
	style_tab_disabled->set_border_color(disabled_bg_color);
	
	Color background_color_opaque = background_color;
	background_color_opaque.a = 1.0;
	theme->set_color("background", "Editor", background_color_opaque);
	theme->set_stylebox("Background", "EditorStyles", make_flat_stylebox(background_color_opaque, default_margin_size, default_margin_size, default_margin_size, default_margin_size));
	
	theme->set_stylebox("Focus", "EditorStyles", style_widget_focus);