Error: Attachment does not have contentType.

[JasonJordan00]

Have a survey that is meant to be opened using the inbox to view current features and submit a pass/fail on them. On a very small percentage (few dozen out of thousands) some users are getting a "500 Error: Attachment does not have contentType". 

The layer is a feature service coming from an SDE so I opened up the attachment table expecting to see some null values in the content type field but everything was present.

Here are the attachments for one of the features that is giving the error. They all appear in the inbox as existing photos. Any ideas on this would be appreciated!