Entire page cache purged when saving single post

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What would cause the entire page cache (Disk: enhanced) to be purged when a single post is updated?

I have only “Front page” and “rss2” checked under “Purge Policy” and the “Additional Pages” textarea is empty, yet if I update a post (let’s say, quick edit and hit save) the entire page cache is purged.

If I use wp CLI to clear one specific post ID, only that post is purged as expected.

 

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