### 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)

Ref<StyleBoxFlat> control_editor_popup_style = style_popup->duplicate();
	control_editor_popup_style->set_shadow_size(0);
	control_editor_popup_style->set_content_margin(SIDE_LEFT, default_margin_size * EDSCALE);
	control_editor_popup_style->set_content_margin(SIDE_TOP, default_margin_size * EDSCALE);
	control_editor_popup_style->set_content_margin(SIDE_RIGHT, default_margin_size * EDSCALE);
	control_editor_popup_style->set_content_margin(SIDE_BOTTOM, default_margin_size * EDSCALE);
	control_editor_popup_style->set_border_width_all(0);
	theme->set_stylebox("panel", "ControlEditorPopupPanel", control_editor_popup_style);
	theme->set_type_variation("ControlEditorPopupPanel", "PopupPanel");
	
	theme->set_icon("updown", "SpinBox", theme->get_icon(SNAME("GuiSpinboxUpdown"), SNAME("EditorIcons")));
	theme->set_icon("updown_disabled", "SpinBox", theme->get_icon(SNAME("GuiSpinboxUpdownDisabled"), SNAME("EditorIcons")));
	
	theme->set_stylebox("background", "ProgressBar", make_stylebox(theme->get_icon(SNAME("GuiProgressBar"), SNAME("EditorIcons")), 4, 4, 4, 4, 0, 0, 0, 0));
	theme->set_stylebox("fill", "ProgressBar", make_stylebox(theme->get_icon(SNAME("GuiProgressFill"), SNAME("EditorIcons")), 6, 6, 6, 6, 2, 1, 2, 1));
	theme->set_color("font_color", "ProgressBar", font_color);
	theme->set_color("font_outline_color", "ProgressBar", font_outline_color);
	theme->set_constant("outline_size", "ProgressBar", 0);
	
	theme->set_stylebox("panel", "GraphEdit", style_tree_bg);
	if (dark_theme) {
		theme->set_color("grid_major", "GraphEdit", Color(1.0, 1.0, 1.0, 0.15));
		theme->set_color("grid_minor", "GraphEdit", Color(1.0, 1.0, 1.0, 0.07));
	} else {
		theme->set_color("grid_major", "GraphEdit", Color(0.0, 0.0, 0.0, 0.15));
		theme->set_color("grid_minor", "GraphEdit", Color(0.0, 0.0, 0.0, 0.07));
	}
	theme->set_color("selection_fill", "GraphEdit", theme->get_color(SNAME("box_selection_fill_color"), SNAME("Editor")));
	theme->set_color("selection_stroke", "GraphEdit", theme->get_color(SNAME("box_selection_stroke_color"), SNAME("Editor")));
	theme->set_color("activity", "GraphEdit", accent_color);