Slightly confusing error on WA

Surely, we ought to display the test case that gave us WA, not the slowest one? (I didn't read carefully and was convinced it was a problemtools bug for a minute).

<img width="938" height="155" alt="Image" src="https://github.com/user-attachments/assets/15450fa9-a248-4cf8-9b01-0329ef5f737b" />