diff -r be944660c56a -r 3d72ae0968f4 wp/wp-admin/includes/class-wp-ms-themes-list-table.php
--- a/wp/wp-admin/includes/class-wp-ms-themes-list-table.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-admin/includes/class-wp-ms-themes-list-table.php	Tue Sep 27 16:37:53 2022 +0200
@@ -505,10 +505,13 @@
 	 * Handles the checkbox column output.
 	 *
 	 * @since 4.3.0
+	 * @since 5.9.0 Renamed `$theme` to `$item` to match parent class for PHP 8 named parameter support.
 	 *
-	 * @param WP_Theme $theme The current WP_Theme object.
+	 * @param WP_Theme $item The current WP_Theme object.
 	 */
-	public function column_cb( $theme ) {
+	public function column_cb( $item ) {
+		// Restores the more descriptive, specific name for use within this method.
+		$theme       = $item;
 		$checkbox_id = 'checkbox_' . md5( $theme->get( 'Name' ) );
 		?>
 		<input type="checkbox" name="checked[]" value="<?php echo esc_attr( $theme->get_stylesheet() ); ?>" id="<?php echo $checkbox_id; ?>" />
@@ -718,7 +721,7 @@
 
 		if ( $theme->get( 'ThemeURI' ) ) {
 			/* translators: %s: Theme name. */
-			$aria_label = sprintf( __( 'Visit %s homepage' ), $theme->display( 'Name' ) );
+			$aria_label = sprintf( __( 'Visit theme site for %s' ), $theme->display( 'Name' ) );
 
 			$theme_meta[] = sprintf(
 				'<a href="%s" aria-label="%s">%s</a>',
@@ -855,13 +858,12 @@
 	 * Handles default column output.
 	 *
 	 * @since 4.3.0
+	 * @since 5.9.0 Renamed `$theme` to `$item` to match parent class for PHP 8 named parameter support.
 	 *
-	 * @param WP_Theme $theme       The current WP_Theme object.
+	 * @param WP_Theme $item        The current WP_Theme object.
 	 * @param string   $column_name The current column name.
 	 */
-	public function column_default( $theme, $column_name ) {
-		$stylesheet = $theme->get_stylesheet();
-
+	public function column_default( $item, $column_name ) {
 		/**
 		 * Fires inside each custom column of the Multisite themes list table.
 		 *
@@ -871,7 +873,12 @@
 		 * @param string   $stylesheet  Directory name of the theme.
 		 * @param WP_Theme $theme       Current WP_Theme object.
 		 */
-		do_action( 'manage_themes_custom_column', $column_name, $stylesheet, $theme );
+		do_action(
+			'manage_themes_custom_column',
+			$column_name,
+			$item->get_stylesheet(), // Directory name of the theme.
+			$item // Theme object.
+		);
 	}
 
 	/**