Index: src/wp-content/themes/twentytwenty/assets/css/editor-style-classic-rtl.css
===================================================================
--- src/wp-content/themes/twentytwenty/assets/css/editor-style-classic-rtl.css	(revision 47262)
+++ src/wp-content/themes/twentytwenty/assets/css/editor-style-classic-rtl.css	(working copy)
@@ -246,7 +246,6 @@
 /* Blockquote -------------------------------- */
 
 body#tinymce.wp-editor.content blockquote {
-	border-style: solid;
 	border: none;
 	border-right: 2px solid #cd2653;
 	margin: 0 0 1.6em 0;
Index: src/wp-content/themes/twentytwenty/assets/css/editor-style-classic.css
===================================================================
--- src/wp-content/themes/twentytwenty/assets/css/editor-style-classic.css	(revision 47262)
+++ src/wp-content/themes/twentytwenty/assets/css/editor-style-classic.css	(working copy)
@@ -246,7 +246,6 @@
 /* Blockquote -------------------------------- */
 
 body#tinymce.wp-editor.content blockquote {
-	border-style: solid;
 	border: none;
 	border-left: 2px solid #cd2653;
 	margin: 0 0 1.6em 0;