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TB 91.2.0, IMAP, attachment present in the email, is corrupt or damaged.

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Recently I moved from Thunderbird 52.9.1 > Thunderbird 91.2.0, OSX 10.14.6, IMAP, and now when incoming message contains attachment, for example pdf, and I click the attachment, only 27 byte file is downloaded and the file is reported as corrupt. After changing "mail.server.default.fetch_by_chunks = true > false" attachment opens fine inside the message and after that I can drag and drop it to desktop or use "Save all" or at right click "Save as..." and the file is OK.

But when I don't click/open attachment and just drag and drop it to desktop or use "Save all" or right click "Save as...", again only 27 byte file is downloaded (file is corrupt/damaged) and taskbar shows forever "Downloading message..."

So seems that without opening attachment first inside the message, simple drag & drop won't initiate attachment download process. However, this was working fine in Thunderbird 52.9.1, so is this a bug (if so how to fix it) or a feature?

Attached screenshots

Modified by ksuuk

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