Inline images showing as attachments intermittently

From a Notes user to a Notes user internally in a business, some e-mails inline images get stripped out of the e-mail and shown as attachments. If the e-mail is forward or replied to, then the images show again as inline images correctly but the original e-mail in the inbox still does not show the inline images as inline.

The preference option ‘show inline images’ is not ticked. This is intermittent, it happens in a few e-mails between specific users.

Any ideas?

Subject: Same issue in 852

We sometimes have the exact same issue. Notes 8.5.2.