Godot 4.0 UI blur background

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7892

I want to blur the background when a ui window is open.
In 3.x you can apply this simple shader to a ColorRect and done but this does not work in 4.0
The shader works but it only blurs the ui or blurs nothing, depending on the z index. It looks like SCREEN_TEXTURE never returns the actual texture I want (the 3D scene).
Its probably just something that is now different in 4.0 but I dont know what.

https://github.com/godotengine/godot-demo-projects/blob/master/2d/screen_space_shaders/shaders/blur.shader

7892

For some reasons the alpha of SCREEN_TEXTURE was 0 and that was the reason why the background blur didnt worked.
Changing it to 255 solved the "problem" (?) for me.
Is this expected?