The current implementation works only if the current search criteria of the library allow display of a new atom, with all meta data set to defaults.
This is typically not the case if the user creates a new atom just because he/she could not find one in the library with a given set of search items : the library view remains empty after creation of the new atom, and it won't be inserted.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.