Look at the screenshots. This happened to me in creative mode. While standing in Lava and suffocating in a block at the same time, the screen doesn't go all the way black, but only a stripe in the middle (vertically) and at the top (horizontally).
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is duplicated by 2
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Confirmed. Looks like an alpha-blending issue where the fire clips closer to the screen than the suffocation overlay which doesn't check for alpha-blending.
confirmed http://imgur.com/KuOF5