I remember a NYT puzzle sometime within the last 2 or 3 years with a 15 character vertical answer spanning the puzzle from top to bottom right down the center with a clue related to Alice in Wonderland. The answer was "the looking glass".
Everything entirely to the left of the looking glass was normal. Horizontal answers entirely to the right of the looking glass were reversed. Horizontal answers that crossed the looking glass were all palindromes centered on the looking glass.
BTW, for those interested in the NYT puzzle but not interested in the newspaper, here's a trick to save some money.
The puzzle and the paper are sold as separate products. The print editions are always bundled together, but the digital editions are separate. The puzzle is about $40/year. However, if you also subscribe to the digital newspaper, you get a 50% discount on a puzzle subscription.
Here's the trick: if you have the puzzle subscription set to automatically renew it continues to renew at the 50% discount rate even if you have cancelled the newspaper subscription.