### 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("guide_color", "ItemList", guide_color);
	theme->set_constant("v_separation", "ItemList", force_even_vsep * 0.5 * EDSCALE);
	theme->set_constant("h_separation", "ItemList", 6 * EDSCALE);
	theme->set_constant("icon_margin", "ItemList", 6 * EDSCALE);
	theme->set_constant("line_separation", "ItemList", 3 * EDSCALE);
	theme->set_constant("outline_size", "ItemList", 0);
	
	Ref<StyleBoxFlat> style_tabbar_background = make_flat_stylebox(dark_color_1, 0, 0, 0, 0, corner_radius * EDSCALE);
	style_tabbar_background->set_corner_radius(CORNER_BOTTOM_LEFT, 0);
	style_tabbar_background->set_corner_radius(CORNER_BOTTOM_RIGHT, 0);
	theme->set_stylebox("tabbar_background", "TabContainer", style_tabbar_background);
	theme->set_stylebox("tab_selected", "TabContainer", style_tab_selected);
	theme->set_stylebox("tab_hovered", "TabContainer", style_tab_hovered);
	theme->set_stylebox("tab_unselected", "TabContainer", style_tab_unselected);
	theme->set_stylebox("tab_disabled", "TabContainer", style_tab_disabled);
	theme->set_stylebox("tab_selected", "TabBar", style_tab_selected);
	theme->set_stylebox("tab_hovered", "TabBar", style_tab_hovered);
	theme->set_stylebox("tab_unselected", "TabBar", style_tab_unselected);
	theme->set_stylebox("tab_disabled", "TabBar", style_tab_disabled);
	theme->set_stylebox("button_pressed", "TabBar", style_menu);
	theme->set_stylebox("button_highlight", "TabBar", style_menu);
	theme->set_color("font_selected_color", "TabContainer", font_color);
	theme->set_color("font_hovered_color", "TabContainer", font_color);
	theme->set_color("font_unselected_color", "TabContainer", font_disabled_color);
	theme->set_color("font_outline_color", "TabContainer", font_outline_color);
	theme->set_color("font_selected_color", "TabBar", font_color);
	theme->set_color("font_hovered_color", "TabBar", font_color);
	theme->set_color("font_unselected_color", "TabBar", font_disabled_color);
	theme->set_color("font_outline_color", "TabBar", font_outline_color);
	theme->set_color("drop_mark_color", "TabContainer", tab_highlight);