Unable to open Cbz files as they are recognized as fb2 when downloading from Calibre OPDS

[frjf]

koreader/koreader#12711 (comment)

It seems this is a calibre-web bug: when downloading *.cbz files (from calibre-web OPDS) they are "transformed" into *.fb2.zip files and have to be renamed to be opened by KOreader.

Short Notice from the maintainer

After 6 years of more or less intensive programming on Calibre-Web, I need a break.
The last few months, maintaining Calibre-Web has felt more like work than a hobby. I felt pressured and teased by people to solve "their" problems and merge PRs for "their" Calibre-Web.
I have turned off all notifications from Github/Discord and will now concentrate undisturbed on the development of “my” Calibre-Web over the next few weeks/months.
I will look into the issues and maybe also the PRs from time to time, but don't expect a quick response from me.

Please also have a look at our Contributing Guidelines

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To Reproduce

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2. Click on '....'
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4. See error

Logfile

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Expected behavior

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Environment (please complete the following information):

• OS: [e.g. Windows 10/Raspberry Pi OS]
• Python version: [e.g. python2.7]
• Calibre-Web version: [e.g. 0.6.8 or 087c4c5 (git rev-parse --short HEAD)]:
• Docker container: [None/LinuxServer]:
• Special Hardware: [e.g. Rasperry Pi Zero]
• Browser: [e.g. Chrome 83.0.4103.97, Safari 13.3.7, Firefox 68.0.1 ESR]

Additional context
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