See also: https://en.support.wordpress.com/topics/
The combined total of categories and tags on any post must not exceed 15 or it will not display on Categories and Tags pages and in the WordPress.COM Reader. After removal of the excess categories and/or tags note it may take several days for your posts to begin displaying there and in the Reader.
Also, note that posts do not display in the Reader forever. Posts only display in the WordPress.COM Reader for 60 days.
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