When in water, a water texture is overlayed onto your screen. However, when the window size is resized, the overlay is small, compared to the window size. I will attach a screenshot.
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Still happens in 1.10.2; seems game does not have to be resized- any non-standard aspect ratio causes it (attached screenshot).
Confirmed for 17w06a (refer to attached screenshot timestamped 2017-03-11_03.29.42.png for extra info).
Was fixed in MC-9406