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Update: It appears that the slash-null culprit is Reeder 5.5.1, helpfully identifying itself only as "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)".
Mastodon FeedMastodon FeedMastodon FeedUpdate: It appears that the slash-null culprit is Reeder 5.5.1, helpfully identifying itself only as "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)".