An example of file that error happen
10E.ods (application/vnd.oasis.opendocument.spreadsheet), 28.52 KB, created by António Galvão on 2021-09-01 15:49:18 UTC
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Creator: António Galvão
Created: 2021-09-01 15:49:18 UTC
Size: 28.52 KB

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

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Attachments on bug 144244: 174705 | 174765 | 176507