### 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("sv_width", "ColorPicker", 256 * EDSCALE);
	theme->set_constant("sv_height", "ColorPicker", 256 * EDSCALE);
	theme->set_constant("h_width", "ColorPicker", 30 * EDSCALE);
	theme->set_constant("label_width", "ColorPicker", 10 * EDSCALE);
	theme->set_constant("center_slider_grabbers", "ColorPicker", 1);
	theme->set_icon("screen_picker", "ColorPicker", theme->get_icon(SNAME("ColorPick"), SNAME("EditorIcons")));
	theme->set_icon("shape_circle", "ColorPicker", theme->get_icon(SNAME("PickerShapeCircle"), SNAME("EditorIcons")));
	theme->set_icon("shape_rect", "ColorPicker", theme->get_icon(SNAME("PickerShapeRectangle"), SNAME("EditorIcons")));
	theme->set_icon("shape_rect_wheel", "ColorPicker", theme->get_icon(SNAME("PickerShapeRectangleWheel"), SNAME("EditorIcons")));
	theme->set_icon("add_preset", "ColorPicker", theme->get_icon(SNAME("Add"), SNAME("EditorIcons")));
	theme->set_icon("sample_bg", "ColorPicker", theme->get_icon(SNAME("GuiMiniCheckerboard"), SNAME("EditorIcons")));
	theme->set_icon("overbright_indicator", "ColorPicker", theme->get_icon(SNAME("OverbrightIndicator"), SNAME("EditorIcons")));
	theme->set_icon("bar_arrow", "ColorPicker", theme->get_icon(SNAME("ColorPickerBarArrow"), SNAME("EditorIcons")));
	theme->set_icon("picker_cursor", "ColorPicker", theme->get_icon(SNAME("PickerCursor"), SNAME("EditorIcons")));
	
	theme->set_icon("bg", "ColorPickerButton", theme->get_icon(SNAME("GuiMiniCheckerboard"), SNAME("EditorIcons")));
	
	Ref<StyleBoxFlat> preset_sb = make_flat_stylebox(Color(1, 1, 1), 2, 2, 2, 2, 2);
	theme->set_stylebox("preset_fg", "ColorPresetButton", preset_sb);
	theme->set_icon("preset_bg", "ColorPresetButton", theme->get_icon(SNAME("GuiMiniCheckerboard"), SNAME("EditorIcons")));
	theme->set_icon("overbright_indicator", "ColorPresetButton", theme->get_icon(SNAME("OverbrightIndicator"), SNAME("EditorIcons")));
	
	Ref<StyleBoxFlat> style_info_3d_viewport = style_default->duplicate();
	style_info_3d_viewport->set_bg_color(style_info_3d_viewport->get_bg_color() * Color(1, 1, 1, 0.5));
	style_info_3d_viewport->set_border_width_all(0);
	theme->set_stylebox("Information3dViewport", "EditorStyles", style_info_3d_viewport);
	
	theme->set_stylebox("bg", "AssetLib", style_empty);
	theme->set_stylebox("panel", "AssetLib", style_content_panel);
	theme->set_color("status_color", "AssetLib", Color(0.5, 0.5, 0.5));