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1) No fallback cache was being saved to disk, with no errors in the cache’s debug.log. After a lot of tweaking finally found the culprit:
Fallback page caching > Prevent to cache URLs without trailing slash = Yes
IMHO, the default should be the less restrictive No that finally worked for me.
2) Also, what is wp-cloudflare-super-page-cache/mydomain.com/cached_html_pages/ being used for? Mine is still empty.
3) For what kind of use cases would one want to enable Fallback page caching > Save response headers?
Thanks.