WP User Manager - Redirect to current post when logging in from wpDiscuz link

wpum_wpDiscuz_login_link.php

<?php

add_filter( 'wpdiscuz_login_link', function ( $login_link ) {
	$login_page = wpum_get_core_page_id( 'login' );

	if ( $login_page ) {
		$login_url     = get_permalink( $login_page );
		$new_login_url = add_query_arg( [
			'redirect_to' => urlencode( get_permalink() . '#comments' ),
		], $login_url );

		$login_link = str_replace( $login_url, $new_login_url, $login_link );
	}

	return $login_link;
} );

You need to ensure the Login URL is set to the URL of your login page in the wpDiscuz Settings > User Authorization and Profile Data

​Then save this file to your /wp-content/mu-plugins/ directory (you might need to create the mu-plugins directory).