Selkie test: count order with entries in both lists

The previous fixture's misread bytes were zeros either way, so reading the
second replacement after the first list still passed (review round 2).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
57fd2f76a6Dara Adedeji committed on 10/14/2026, 3:31:47 PMparent779b827

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