### 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)

obj_styleBox = Ref<StyleBoxTexture>(nullptr);
	atlas_tex = Ref<AtlasTexture>(nullptr);
	preview_tex = Ref<CanvasTexture>(memnew(CanvasTexture));
	
	snap_step = EditorSettings::get_singleton()->get_project_metadata("texture_region_editor", "snap_step", Vector2(8, 8));
	snap_separation = EditorSettings::get_singleton()->get_project_metadata("texture_region_editor", "snap_separation", Vector2());
	snap_mode = EditorSettings::get_singleton()->get_project_metadata("texture_region_editor", "snap_mode", SNAP_NONE);
	edited_margin = -1;
	drag_index = -1;
	drag = false;
	HBoxContainer *hb_tools = memnew(HBoxContainer);
	vb->add_child(hb_tools);
	hb_tools->add_child(memnew(Label(TTR("Snap Mode:"))));
	snap_mode_button = memnew(OptionButton);
	hb_tools->add_child(snap_mode_button);
	snap_mode_button->add_item(TTR("None"), 0);
	snap_mode_button->add_item(TTR("Pixel Snap"), 1);
	snap_mode_button->add_item(TTR("Grid Snap"), 2);
	snap_mode_button->add_item(TTR("Auto Slice"), 3);
	snap_mode_button->select(0);
	snap_mode_button->connect("item_selected", callable_mp(this, &TextureRegionEditor::_set_snap_mode));
	hb_grid = memnew(HBoxContainer);
	hb_tools->add_child(hb_grid);
	hb_grid->add_child(memnew(VSeparator));
	hb_grid->add_child(memnew(Label(TTR("Offset:"))));
	sb_off_x = memnew(SpinBox);
	sb_off_x->set_min(-256);
	sb_off_x->set_max(256);
	sb_off_x->set_step(1);
	sb_off_x->set_value(snap_offset.x);