Index: src/wp-content/themes/twentytwenty/assets/css/editor-style-block-rtl.css
===================================================================
--- src/wp-content/themes/twentytwenty/assets/css/editor-style-block-rtl.css	(revision 54304)
+++ src/wp-content/themes/twentytwenty/assets/css/editor-style-block-rtl.css	(working copy)
@@ -619,12 +619,15 @@
 	width: 1px;
 }
 
-hr.wp-block-separator::before {
+.editor-styles-wrapper hr.wp-block-separator::before {
 	right: calc(50% - 5px);
+	left: auto;
 }
 
-hr.wp-block-separator::after {
+.editor-styles-wrapper hr.wp-block-separator::after {
 	left: calc(50% - 5px);
+	right: auto;
+	border-radius: 0;
 }
 
 /* STYLE: DOTS */
Index: src/wp-content/themes/twentytwenty/assets/css/editor-style-block.css
===================================================================
--- src/wp-content/themes/twentytwenty/assets/css/editor-style-block.css	(revision 54304)
+++ src/wp-content/themes/twentytwenty/assets/css/editor-style-block.css	(working copy)
@@ -623,12 +623,15 @@
 	width: 1px;
 }
 
-hr.wp-block-separator::before {
+.editor-styles-wrapper hr.wp-block-separator::before {
 	left: calc(50% - 5px);
+	right: auto;
 }
 
-hr.wp-block-separator::after {
+.editor-styles-wrapper hr.wp-block-separator::after {
 	right: calc(50% - 5px);
+	left: auto;
+	border-radius: 0;
 }
 
 /* STYLE: DOTS */