Quite sincerely, since there's a lot of case law on competitions, it would be hard for me to cite you in actual decision.
However, at the very least, norms and processes are important in a democracy. The rule of law requires that both the governing and the governed abide by preestablished rules under which actors may act knowing what awaits them.
Clearly in this instance, the rules were changed along the way or, at the very least, that's the impression we get. Perhaps the competition could still be redone, but it appears, in the present circumstances, that the most elegant solution for all parties would be to reverse the decision that was made.