Index: src/wp-content/themes/twentytwenty/style-rtl.css
===================================================================
--- src/wp-content/themes/twentytwenty/style-rtl.css	(revision 58811)
+++ src/wp-content/themes/twentytwenty/style-rtl.css	(working copy)
@@ -3041,6 +3041,15 @@
 	letter-spacing: inherit;
 }
 
+/* Block: Calendar --------------------------- */
+
+.wp-block-calendar[class*="-font-size"] table,
+.wp-block-calendar[style*="font-size"] table,
+.wp-block-calendar[class*="-font-size"] .wp-calendar-nav,
+.wp-block-calendar[style*="font-size"] .wp-calendar-nav {
+	font-size: inherit;
+}
+
 /* Block: Columns ---------------------------- */
 
 .wp-block-columns.alignfull,
Index: src/wp-content/themes/twentytwenty/style.css
===================================================================
--- src/wp-content/themes/twentytwenty/style.css	(revision 58811)
+++ src/wp-content/themes/twentytwenty/style.css	(working copy)
@@ -3061,6 +3061,15 @@
 	letter-spacing: inherit;
 }
 
+/* Block: Calendar --------------------------- */
+
+.wp-block-calendar[class*="-font-size"] table,
+.wp-block-calendar[style*="font-size"] table,
+.wp-block-calendar[class*="-font-size"] .wp-calendar-nav,
+.wp-block-calendar[style*="font-size"] .wp-calendar-nav {
+	font-size: inherit;
+}
+
 /* Block: Columns ---------------------------- */
 
 .wp-block-columns.alignfull,