If try to run "Update Mailchimp Mergevar Values" batch it doesn't work with just PHP notice
Notice: unserialize(): Error at offset 13891 of 30352 bytes in Drupal\Core\Batch\BatchStorage->load() (line 71 of core/lib/Drupal/Core/Batch/BatchStorage.php).
Seems to be close to the https://www.drupal.org/project/contact_storage_export/issues/3049010 → issue.
Closed: won't fix
2.1
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Thanks for submitting this ticket — and sorry we didn’t get back to you about it sooner. We are cleaning up old issues and issue for old versions and are going to close this one. If this issue is still relevant for you, please re-open it and update the “Version” field, and include any updates to the behavior you are seeing.With a smaller issue queue, we’ll have an easier time getting back to you.