### 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_stylebox("panel", "Tree", style_tree_bg);
	theme->set_stylebox("panel", "EditorValidationPanel", style_tree_bg);
	
	theme->set_icon("checked", "Tree", theme->get_icon(SNAME("GuiChecked"), SNAME("EditorIcons")));
	theme->set_icon("indeterminate", "Tree", theme->get_icon(SNAME("GuiIndeterminate"), SNAME("EditorIcons")));
	theme->set_icon("unchecked", "Tree", theme->get_icon(SNAME("GuiUnchecked"), SNAME("EditorIcons")));
	theme->set_icon("arrow", "Tree", theme->get_icon(SNAME("GuiTreeArrowDown"), SNAME("EditorIcons")));
	theme->set_icon("arrow_collapsed", "Tree", theme->get_icon(SNAME("GuiTreeArrowRight"), SNAME("EditorIcons")));
	theme->set_icon("arrow_collapsed_mirrored", "Tree", theme->get_icon(SNAME("GuiTreeArrowLeft"), SNAME("EditorIcons")));
	theme->set_icon("updown", "Tree", theme->get_icon(SNAME("GuiTreeUpdown"), SNAME("EditorIcons")));
	theme->set_icon("select_arrow", "Tree", theme->get_icon(SNAME("GuiDropdown"), SNAME("EditorIcons")));
	theme->set_stylebox("focus", "Tree", style_widget_focus);
	theme->set_stylebox("custom_button", "Tree", make_empty_stylebox());
	theme->set_stylebox("custom_button_pressed", "Tree", make_empty_stylebox());
	theme->set_stylebox("custom_button_hover", "Tree", style_widget);
	theme->set_color("custom_button_font_highlight", "Tree", font_hover_color);
	theme->set_color("font_color", "Tree", font_color);
	theme->set_color("font_selected_color", "Tree", mono_color);
	theme->set_color("font_outline_color", "Tree", font_outline_color);
	theme->set_color("title_button_color", "Tree", font_color);
	theme->set_color("drop_position_color", "Tree", accent_color);
	theme->set_constant("v_separation", "Tree", widget_default_margin.y - EDSCALE);
	theme->set_constant("h_separation", "Tree", 6 * EDSCALE);
	theme->set_constant("guide_width", "Tree", border_width);
	theme->set_constant("item_margin", "Tree", 3 * default_margin_size * EDSCALE);
	theme->set_constant("inner_item_margin_bottom", "Tree", (default_margin_size + extra_spacing) * EDSCALE);
	theme->set_constant("inner_item_margin_left", "Tree", (default_margin_size + extra_spacing) * EDSCALE);
	theme->set_constant("inner_item_margin_right", "Tree", (default_margin_size + extra_spacing) * EDSCALE);
	theme->set_constant("inner_item_margin_top", "Tree", (default_margin_size + extra_spacing) * EDSCALE);
	theme->set_constant("button_margin", "Tree", default_margin_size * EDSCALE);