Community Puzzle: Dominoes Path

While I was doing this puzzle, I had a solution that was passing all the test cases in the IDE except the one called: “Long path scrambled”.
Just by curiosity I submitted it anyway, thinking “it might just pass”. And it did, got 100% on the validation test cases.

Maybe a test case similar to this “Long path scrambled” should be added to the validation tests?

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I had the exact same experience. Could not pass Test 5: Long Path Scrambled, but received 100% on submission. (I do that b/c I think that makes it appear as In Progress.) Given the success rate of 74%, I am curious how many people that gave up because they couldn’t pass Test 5 would actually pass submission if they knew this. But before changing the validation test, maybe a re-examine of Test 5 first?