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`fillVolumeGaps` incorrectly left chapters null when surrounded by two different non-null volumes (e.g. Vol10 → null → Vol11). Simplify the condition to always prefer the previous volume, covering all cases. Also fix `InMemoryMangaRepository::findExistingChaptersByNumbers` to return an array keyed by chapter number, matching the Doctrine contract. Add 5 unit tests for MangadxChapterSynchronizationService covering volume transitions, start-of-series gaps, explicit volumes, FR/EN priority, and deduplication of existing chapters.