### 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_icon("decrement_highlight", "VScrollBar", empty_icon);
	theme->set_icon("decrement_pressed", "VScrollBar", empty_icon);
	
	theme->set_icon("grabber_highlight", "HSlider", theme->get_icon(SNAME("GuiSliderGrabberHl"), SNAME("EditorIcons")));
	theme->set_icon("grabber", "HSlider", theme->get_icon(SNAME("GuiSliderGrabber"), SNAME("EditorIcons")));
	theme->set_stylebox("slider", "HSlider", make_flat_stylebox(dark_color_3, 0, default_margin_size / 2, 0, default_margin_size / 2, corner_width));
	theme->set_stylebox("grabber_area", "HSlider", make_flat_stylebox(contrast_color_1, 0, default_margin_size / 2, 0, default_margin_size / 2, corner_width));
	theme->set_stylebox("grabber_area_highlight", "HSlider", make_flat_stylebox(contrast_color_1, 0, default_margin_size / 2, 0, default_margin_size / 2));
	theme->set_constant("center_grabber", "HSlider", 0);
	theme->set_constant("grabber_offset", "HSlider", 0);
	
	theme->set_icon("grabber", "VSlider", theme->get_icon(SNAME("GuiSliderGrabber"), SNAME("EditorIcons")));
	theme->set_icon("grabber_highlight", "VSlider", theme->get_icon(SNAME("GuiSliderGrabberHl"), SNAME("EditorIcons")));
	theme->set_stylebox("slider", "VSlider", make_flat_stylebox(dark_color_3, default_margin_size / 2, 0, default_margin_size / 2, 0, corner_width));
	theme->set_stylebox("grabber_area", "VSlider", make_flat_stylebox(contrast_color_1, default_margin_size / 2, 0, default_margin_size / 2, 0, corner_width));
	theme->set_stylebox("grabber_area_highlight", "VSlider", make_flat_stylebox(contrast_color_1, default_margin_size / 2, 0, default_margin_size / 2, 0));
	theme->set_constant("center_grabber", "VSlider", 0);
	theme->set_constant("grabber_offset", "VSlider", 0);
	
	theme->set_color("default_color", "RichTextLabel", font_color);
	theme->set_color("font_shadow_color", "RichTextLabel", Color(0, 0, 0, 0));
	theme->set_color("font_outline_color", "RichTextLabel", font_outline_color);
	theme->set_color("selection_color", "RichTextLabel", selection_color);
	theme->set_constant("shadow_offset_x", "RichTextLabel", 1 * EDSCALE);
	theme->set_constant("shadow_offset_y", "RichTextLabel", 1 * EDSCALE);
	theme->set_constant("shadow_outline_size", "RichTextLabel", 1 * EDSCALE);
	theme->set_constant("outline_size", "RichTextLabel", 0);
	theme->set_stylebox("focus", "RichTextLabel", make_empty_stylebox());
	theme->set_stylebox("normal", "RichTextLabel", style_tree_bg);