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After upgrading to Astra 4.0.x, the old astra_single_post_meta filter does not work anymore. The filter is still in the code (single-blog.php) so I’m not sure if it’s deprecated or not. It’s at least not mentioned as deprecated in the change log for Astra 4.0.0 or Astra 4.0.1.
While waiting for official documentation, I found another filter to use: astra_single_banner_post_meta (blog.php).