How to Fix Notice: Ob_end_flush(): Failed To Send Buffer Of Zlib Output Compression (1) In

WordPress attempts to flush the output buffers on shutdown. It fails because you have already called ob_end_flush().
You should be able to keep compression on, and simply unhook the flush action:

remove_action( 'shutdown', 'wp_ob_end_flush_all', 1 );

You can now call ob_end_flush() manually, and keep zlib compression on.

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