Discomantis
Veteran
Yiheng should know better and should not have started the timer. At the very least, he should have called over a delegate immediately to appeal, and should not have timed the solve. Doing so is a very easy way to cheat.If he appealed to a judge then the solve was not an attempt. He solved it for rescrambling and started the timer for fun.
Edit: I want to clarify that in my opinion the WR should not count. But we all saw the score sheet thus we have a contradiction and Yiheng did not appeal for an extra
Also, on what you said about the score sheet, I would not consider that definite proof that he did not appeal. There is a possibility that the judge wrote down the time even though he appealed durign inspection. What it does show however is that he did time the solve on that scramble, which is something that he should not have done.
Regulation 11e says: "The competitor should appeal verbally or in writing to the judge and WCA Delegate at the time of the incident, before finishing the original attempt, to be eligible for an extra attempt."
He continued the attempt by starting the timer. That violates 11e.
However, you could also take the interpretation that, since he didn't sign for the attempt, he technically didn't finish the attempt, thus warrenting an extra attempt.
Regulation A7c says: "The competitor must check the recorded result, and sign (or initial) the score sheet to acknowledge that the result is correct, complete, properly formatted, and clearly readable. This finishes the attempt."
Regardless of which you think is correct, what Yiheng did was unfair and he should not have been given an extra attempt. This shows a flaw in the regulations at best.