WP Glossary - Add Gutenberg Support

functions.php

<?php
// WP Glossary - Add Gutenberg Support
// Need help: https://bloggerpilot.com/snippet-wp-glossary-gutenberg/

// Add support for Gutenberg
add_filter ( 'wpg_post_type_glossary_args', 'bp_wpg_post_editor' );
function bp_wpg_post_editor ( $args ) {
    $args['show_in_rest'] = true; // for Gutenberg Editor
    return $args;
}

// Add support for taxomonies in Gutenberg
add_filter ( 'register_taxonomy_args', 'bp_taxonomy_args', 10, 2 );
function bp_taxonomy_args( $args, $taxonomy_name ) {
    if ( 'glossary_cat' === $taxonomy_name ) {
        $args['show_in_rest'] = true;
    }
    if ( 'glossary_tag' === $taxonomy_name ) {
        $args['show_in_rest'] = true;
    }
    return $args;
}