Script isn't deleting watched items

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The script works for deleting unwatched Radarr movies, but I have 'watched_deletion_threshold' and 'unwatched_deletion_threshold' both set to 250 days, and when I run the script it only seems to be returning unwatched items and deleting any that aren't exempt.
I can't see which other settings might control this - any idea what I could be doing wrong?