[Community Puzzle] Tennis score

Hi,
don’t get validator 12, I decipher the match and got this:

J.Isner Q.Halys
5
53 DA 91 AC 1E 8F 0F 27 51 86 D1 B0 BB 0E C5 8A F3 BC 3F 85 18 46 6B 5F C2 E4 10 15 C5 56 8D 8D B0 F6 61 B2 67 00

and

J.Isner… 7 4 7 7
Q.Halys… 6 6 6 6
J.Isner wins

it passes custom test case but fails the validator…I just don’t get it, any hint on the test case ?