### 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
glDeleteTextures(E.value.allocated_textures.size(), E.value.allocated_textures.ptr());
		
		if (E.value.fbo != rt->fbo) {
			glDeleteFramebuffers(1, &E.value.fbo);
		}
	}
	rt->overridden.fbo_cache.clear();
	if (rt->fbo) {
		glDeleteFramebuffers(1, &rt->fbo);
		rt->fbo = 0;
	}
	if (rt->overridden.color.is_null()) {
		if (rt->texture.is_valid()) {
			Texture *tex = get_texture(rt->texture);
			tex->alloc_height = 0;
			tex->alloc_width = 0;
			tex->width = 0;
			tex->height = 0;
			tex->active = false;
			tex->render_target = nullptr;
			tex->is_render_target = false;
			tex->gl_set_filter(RS::CANVAS_ITEM_TEXTURE_FILTER_MAX);
			tex->gl_set_repeat(RS::CANVAS_ITEM_TEXTURE_REPEAT_MAX);
		}
	} else {
		Texture *tex = get_texture(rt->overridden.color);
		tex->render_target = nullptr;
		tex->is_render_target = false;
	}
	if (rt->overridden.color.is_valid()) {