chmod(): Operation not permitted on WP v5.3 update.

[jsmoriss]

I get a long list of the following errors during the WP v5.3 update:

Warning: chmod(): Operation not permitted in /.../wordpress/wp-admin/includes/class-wp-filesystem-direct.php on line 168

There is no information on the file being modified, and looking at the source of that PHP script, there is no error handling for a failed chmod().

js.