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Looks good – you don’t need to execute PHP in this case though.

Can we try this?:

<script>
    jQuery( document ).on( 'facetwp-loaded', function() {
        console.log( 'loaded!' );
        jQuery( '.wp-show-posts-masonry' ).masonry( 'layout' );
    } );
</script>

Now right click your page, click “Inspect” and go to the “Console” tab. Then load FacetWP – does the word “loaded!” appear in the console?