file with frames. demonstrates the problem
bug frame comment.odt (application/vnd.oasis.opendocument.text), 10.84 KB, created by Bernhard Breinbauer on 2020-04-19 09:46:26 UTC
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Creator: Bernhard Breinbauer
Created: 2020-04-19 09:46:26 UTC
Size: 10.84 KB

Attachment is not viewable in your browser because its MIME type (application/vnd.oasis.opendocument.text) is not one that your browser is able to display.

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Attachments on bug 132245: 159696