The qualification round actually had at least one incorrect test case[1] as well, and I got 0 feedback on that one. I asked on the qualification page for clarification, and as far as I could tell, no questions were being answered, and mine was ignored along with the rest.

[1] The Peg problem stated that there would be no ties, while the second example clearly had a tie. Again, they updated the tests, but only in the last 24 hours of the competition I believe, and with no notification to any of the competitors.