Index: wp-content/themes/twentytwenty/inc/template-tags.php
===================================================================
--- wp-content/themes/twentytwenty/inc/template-tags.php	(revision 46878)
+++ wp-content/themes/twentytwenty/inc/template-tags.php	(working copy)
@@ -338,7 +338,7 @@
 				do_action( 'twentytwenty_start_of_post_meta_list', $post_id, $post_meta, $location );
 
 				// Author.
-				if ( in_array( 'author', $post_meta, true ) ) {
+				if ( post_type_supports( get_post_type( $post_id ), 'author' ) && in_array( 'author', $post_meta, true ) ) {
 
 					$has_meta = true;
 					?>
Index: wp-content/themes/twentytwenty/template-parts/content-cover.php
===================================================================
--- wp-content/themes/twentytwenty/template-parts/content-cover.php	(revision 46878)
+++ wp-content/themes/twentytwenty/template-parts/content-cover.php	(working copy)
@@ -146,7 +146,7 @@
 		// Single bottom post meta.
 		twentytwenty_the_post_meta( get_the_ID(), 'single-bottom' );
 
-		if ( is_single() ) {
+		if ( post_type_supports( get_post_type( get_the_ID() ), 'author' ) && is_single() ) {
 
 			get_template_part( 'template-parts/entry-author-bio' );
 
Index: wp-content/themes/twentytwenty/template-parts/content.php
===================================================================
--- wp-content/themes/twentytwenty/template-parts/content.php	(revision 46878)
+++ wp-content/themes/twentytwenty/template-parts/content.php	(working copy)
@@ -57,7 +57,7 @@
 		// Single bottom post meta.
 		twentytwenty_the_post_meta( get_the_ID(), 'single-bottom' );
 
-		if ( is_single() ) {
+		if ( post_type_supports( get_post_type( get_the_ID() ), 'author' ) && is_single() ) {
 
 			get_template_part( 'template-parts/entry-author-bio' );