### Godot version

v4.0.beta17.official [c40020513]

### System information

Windows 11, OpenGL (Compatibility), RTX 2060 (31.0.15.2824)

### Issue description

I tried to make a blurred panel for a ui element with texturelod via shader:

```glsl
shader_type canvas_item;

uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap_anisotropic;
uniform float blur_amount : hint_range(0.0, 5.0);

void fragment() {
	vec4 blurred = textureLod(SCREEN_TEXTURE, SCREEN_UV, blur_amount);
	COLOR = blurred;
}
```

but what I got instead is this:
![image](https://user-images.githubusercontent.com/72286622/217170426-49f6712d-47ef-4c53-b9f1-30d8ad868084.png)

vulkan renderer does not exhibit this issue:
![image](https://user-images.githubusercontent.com/72286622/217170565-a013c712-94f6-49d1-b9ec-091c28a7790b.png)


### Steps to reproduce

1. Add a TextureRect node
2. Add a Panel node to overlay the previously added node
3. Apply the blur shader to the panel node

### Minimal reproduction project

N/A
ERR_FAIL_COND(p_layers.is_empty());
	ERR_FAIL_COND(p_layered_type == RS::TEXTURE_LAYERED_CUBEMAP && p_layers.size() != 6);
	ERR_FAIL_COND_MSG(p_layered_type == RS::TEXTURE_LAYERED_CUBEMAP_ARRAY, "Cubemap Arrays are not supported in the GL Compatibility backend.");
	Ref<Image> image = p_layers[0];
	{
		int valid_width = 0;
		int valid_height = 0;
		bool valid_mipmaps = false;
		Image::Format valid_format = Image::FORMAT_MAX;
		for (int i = 0; i < p_layers.size(); i++) {
			ERR_FAIL_COND(p_layers[i]->is_empty());
			if (i == 0) {
				valid_width = p_layers[i]->get_width();
				valid_height = p_layers[i]->get_height();
				valid_format = p_layers[i]->get_format();
				valid_mipmaps = p_layers[i]->has_mipmaps();