Trying to import config changes with permissions results in "The database connection is not serialisable"

On an RC1 site we're developing I'm noticing that trying to import config between sites is resulting in the following error:

LogicException: The database connection is not serialisable. This probably means you are serializing an object that has an indirect reference to the database connection. Adjust your code so that is not necessary. Alternatively, look at DependencySerializationTrait as a temporary solution. in Drupal\Core\Database\Connection->__sleep() (line 1433 of /var/www/docroot/core/lib/Drupal/Core/Database/Connection.php).

This happens when trying to import a single config file with permission (1 or 2 differences) changes. Just posting this quick report in case anyone else has seen this issue. I haven't tested this on a fresh install but can do if it seems like this needs more attention.