Ticket #58457: 58457.2.patch

src/wp-includes/class-wp-theme-json.php

@@ -807 +807 @@
                 }
                 $new_selectors = array();
                 $selectors     = explode( ',', $selector );
-                foreach ( $selectors as $sel ) {
-                        $new_selectors[] = 'right' === $position ? $sel . $to_append : $to_append . $sel;
+                if ( 'right' === $position ) {
+                        foreach ( $selectors as $sel ) {
+                                $new_selectors[] = $sel . $to_append;
+                        }
+                } else {
+                        foreach ( $selectors as $sel ) {
+                                $new_selectors[] = $to_append . $sel;
+                        }
                 }
                 return implode( ',', $new_selectors );
         }