### 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)

#include "atlas_texture.h"
#include "core/core_string_names.h"
int AtlasTexture::get_width() const {
	if (region.size.width == 0) {
		if (atlas.is_valid()) {
			return atlas->get_width();
		}
		return 1;
	} else {
		return region.size.width + margin.size.width;
	}
}
int AtlasTexture::get_height() const {
	if (region.size.height == 0) {
		if (atlas.is_valid()) {
			return atlas->get_height();
		}
		return 1;
	} else {
		return region.size.height + margin.size.height;
	}
}
RID AtlasTexture::get_rid() const {