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The suggested fix looks basically correct to me - the problem is that the new except clause added by that patch is currently missing the "don't re-raise the passed in exception" logic needed to fully abide by the context management protocol, but we missed that on the patch review.
The only tweak I would recommend is putting that check before the check for StopIteration being converted to RuntimeError so it's immediately obvious to the reader that it takes priority over the exc.__cause__ check.
The comment on that clause should also be adjusted to reflect the fixed behaviour.