Ticket #55931: #55931.patch

wp-content/themes/twentytwenty/assets/css/editor-style-block.css

@@ -658 +658 @@
         line-height: 1.25;
 }
 
+.editor-styles-wrapper .wp-block-quote cite {
+        font-style: normal;
+}
+
 .editor-styles-wrapper .wp-block-quote p {
         color: inherit;
         font-weight: 400;