Camera2d clipViewport breaks the ScreenShader texture sampling

If I set the camera.clipViewport to true, and use a simple texture sampling in screen shader like this : texture.get(input.uv); playing with the size of the window, cuts the screen weirdly:

UV coordinates seems to be fine but texture sampling is not:

This seems to be the case with scalemode stretch or letterbox.(did not tried the other ones)