Comments stopped working after updating to Mime Mail 2.0.0 combined with Comment Notify. Reverting to 1.0.0 brings the comments functionality back.
Use Comment Notify. Update Mime Mail from 1.x.x to 2.0.0. Comment form breaks (when one clicks save button on the comment form) and the following error is printed in Drupal logs:
Object of type Drupal\user\Entity\User cannot be printed
TBD, not sure which module is to blame. But the combination with 1.x.x branch of this module is fine, while 2.0.0 breaks things.
Active
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
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