What worked for me was to unsubscribe from the feed. Then subscribe again. No more big white space in my feed! Yes, that really worked.
Of course all of your followers would likely have to do the same. Really, Adsense needs to fix this.
Perhaps you can try this email address for Google AdSense: firstname.lastname@example.org Don't know where that will get you but found it here: Google AdSense Terms and Conditions
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