### 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)

edited_margin = 3;
						prev_margin = margins[3];
					}
					if (edited_margin >= 0) {
						drag_from = mb->get_position();
						drag = true;
					}
				}
				if (edited_margin < 0 && snap_mode == SNAP_AUTOSLICE) {
					Vector2 point = mtx.affine_inverse().xform(mb->get_position());
					for (const Rect2 &E : autoslice_cache) {
						if (E.has_point(point)) {
							rect = E;
							if (Input::get_singleton()->is_key_pressed(Key::CMD_OR_CTRL) && !(Input::get_singleton()->is_key_pressed(Key(Key::SHIFT | Key::ALT)))) {
								Rect2 r;
								if (atlas_tex.is_valid()) {
									r = atlas_tex->get_region();
								} else if (node_sprite_2d) {
									r = node_sprite_2d->get_region_rect();
								} else if (node_sprite_3d) {
									r = node_sprite_3d->get_region_rect();
								} else if (node_ninepatch) {
									r = node_ninepatch->get_region_rect();
								} else if (obj_styleBox.is_valid()) {
									r = obj_styleBox->get_region_rect();
								}
								rect.expand_to(r.position);
								rect.expand_to(r.get_end());
							}
							undo_redo->create_action(TTR("Set Region Rect"));