get_page_by_title() doesn’t retrieve my post

The second parameter for get_page_by_title() is $output, with the third being $post_type.

This should solve your porblem –

$patchwork = get_page_by_title( 'Patchwork 01', OBJECT, 'patchwork' );    
echo $patchwork->ID;

Please have a look at the Function Reference for get_page_by_title() for more information.

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