Index: wp-content/themes/twentytwenty/assets/css/editor-style-classic-rtl.css
===================================================================
--- wp-content/themes/twentytwenty/assets/css/editor-style-classic-rtl.css	(revision 59114)
+++ wp-content/themes/twentytwenty/assets/css/editor-style-classic-rtl.css	(working copy)
@@ -582,3 +582,8 @@
 body#tinymce.wp-editor.content ul.wp-block-gallery li {
 	margin-right: 0;
 }
+
+/*BLOCK: DETAIL*/
+details[style*="letter-spacing"] * {
+	letter-spacing: inherit;
+}
\ No newline at end of file
Index: wp-content/themes/twentytwenty/assets/css/editor-style-classic.css
===================================================================
--- wp-content/themes/twentytwenty/assets/css/editor-style-classic.css	(revision 59114)
+++ wp-content/themes/twentytwenty/assets/css/editor-style-classic.css	(working copy)
@@ -586,3 +586,8 @@
 body#tinymce.wp-editor.content ul.wp-block-gallery li {
 	margin-left: 0;
 }
+
+/*BLOCK: DETAIL*/
+details[style*="letter-spacing"] * {
+	letter-spacing: inherit;
+}
\ No newline at end of file