### 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_color("close_color", "GraphNode", node_decoration_color);
	theme->set_color("resizer_color", "GraphNode", node_decoration_color);
	theme->set_constant("port_offset", "GraphNode", 0);
	theme->set_constant("title_h_offset", "GraphNode", 12 * EDSCALE);
	theme->set_constant("title_offset", "GraphNode", 21 * EDSCALE);
	theme->set_constant("close_h_offset", "GraphNode", -2 * EDSCALE);
	theme->set_constant("close_offset", "GraphNode", 20 * EDSCALE);
	theme->set_constant("separation", "GraphNode", 1 * EDSCALE);
	theme->set_icon("close", "GraphNode", theme->get_icon(SNAME("GuiCloseCustomizable"), SNAME("EditorIcons")));
	theme->set_icon("resizer", "GraphNode", theme->get_icon(SNAME("GuiResizer"), SNAME("EditorIcons")));
	Ref<ImageTexture> port_icon = theme->get_icon(SNAME("GuiGraphNodePort"), SNAME("EditorIcons"));
	
	port_icon->set_size_override(Size2(12, 12));
	theme->set_icon("port", "GraphNode", port_icon);
	theme->set_font("title_font", "GraphNode", theme->get_font(SNAME("main_bold_msdf"), SNAME("EditorFonts")));
	
	theme->set_constant("v_separation", "GridContainer", Math::round(widget_default_margin.y - 2 * EDSCALE));
	
	theme->set_icon("folder", "FileDialog", theme->get_icon(SNAME("Folder"), SNAME("EditorIcons")));
	theme->set_icon("parent_folder", "FileDialog", theme->get_icon(SNAME("ArrowUp"), SNAME("EditorIcons")));
	theme->set_icon("back_folder", "FileDialog", theme->get_icon(SNAME("Back"), SNAME("EditorIcons")));
	theme->set_icon("forward_folder", "FileDialog", theme->get_icon(SNAME("Forward"), SNAME("EditorIcons")));
	theme->set_icon("reload", "FileDialog", theme->get_icon(SNAME("Reload"), SNAME("EditorIcons")));
	theme->set_icon("toggle_hidden", "FileDialog", theme->get_icon(SNAME("GuiVisibilityVisible"), SNAME("EditorIcons")));
	
	
	theme->set_color("folder_icon_color", "FileDialog", (dark_theme ? Color(1, 1, 1) : Color(4.25, 4.25, 4.25)).lerp(accent_color, 0.7));
	theme->set_color("files_disabled", "FileDialog", font_disabled_color);
	
	theme->set_constant("margin", "ColorPicker", default_margin_size);