Index: wp-includes/functions.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
--- a/wp-includes/functions.php	
+++ b/wp-includes/functions.php	
@@ -8478,7 +8478,8 @@
 
 	// Only write the transient on the top level call and not on recursive calls.
 	if ( $save_cache ) {
-		set_transient( 'dirsize_cache', $directory_cache );
+		$expiration = ( wp_using_ext_object_cache() ) ? 0 : 10 * YEAR_IN_SECONDS;
+		set_transient( 'dirsize_cache', $directory_cache, $expiration );
 	}
 
 	return $size;
@@ -8513,12 +8514,13 @@
 		return;
 	}
 
+	$expiration = ( wp_using_ext_object_cache() ) ? 0 : 10 * YEAR_IN_SECONDS;
 	if (
 		! str_contains( $path, '/' ) &&
 		! str_contains( $path, '\\' )
 	) {
 		unset( $directory_cache[ $path ] );
-		set_transient( 'dirsize_cache', $directory_cache );
+		set_transient( 'dirsize_cache', $directory_cache, $expiration );
 		return;
 	}
 
@@ -8537,7 +8539,7 @@
 		unset( $directory_cache[ $path ] );
 	}
 
-	set_transient( 'dirsize_cache', $directory_cache );
+	set_transient( 'dirsize_cache', $directory_cache, $expiration );
 }
 
 /**