Just a guess - my commit effectively enabled the ext on those two platforms. This test was previously skipping. Also this test currently fails on the other platforms as well.

Please let me know if any of those guesses are wrong.

If those are right, then it's expected that this test would fail on those platforms. (Hsw recently gained es 3.1, but the enablement forgot to flip the ext in question on. I removed the separate enable, effectively flipping it on for hsw.)