Fix pagination issues on CPT Singular Layout Ref#17568

redirect_canonical.php

function _wp_adjust_show_request( $request ) {
        if ($request->query_vars['post_type'] === 'project' && $request->is_singular === true && $request->current_post == -1 && $request->is_paged === true ) {
                add_filter( 'redirect_canonical', '__return_false' );
        }
        return $request;
}
add_action( 'parse_query', '_wp_adjust_show_request' );