Really? IIRC Ilyn Payne and Melisandre were both still on her list in season 5. Thoros of Myr and Beric Dondarrion were the two who were alive, but weren’t included.

Just heads up: the reason Arya’s list was so short was because she was lying to the waif. It wasn’t accidentally/mysteriously shortened, it was done to demonstrate she could now successfully fudge details.