Ticket #56748: 56748.1.patch

src/wp-content/themes/twentytwentyone/assets/sass/05-blocks/image/_style.scss

@@ -57 +57 @@
                         @include media(mobile-only) {
                                 margin-left: 0;
                                 margin-right: 0;
+                                float: none;
                         }
                 }
         }