Ultimately, the issue was that the og:url was pointing to the wrong URL, so even refreshing FB cache, I eventually had the same issue (as soon as it indexed the landing page of the blog) because FB looks for the image associated to the URL in og:url instead of the page URL.
I must say that this issue happened a few months back (this is one of the drafts I've had written but not published for a long time). Maybe it doesn't work the same anymore. I should check 😳
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Ultimately, the issue was that the og:url was pointing to the wrong URL, so even refreshing FB cache, I eventually had the same issue (as soon as it indexed the landing page of the blog) because FB looks for the image associated to the URL in og:url instead of the page URL.
I must say that this issue happened a few months back (this is one of the drafts I've had written but not published for a long time). Maybe it doesn't work the same anymore. I should check 😳