Emtpy preview for old DJVU files

My old DJVU files are identified as images, which leads to an empty preview:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/v2ihpwuo2tl1hlwa8n1o.png

I had previously reported the problem here:
https://forums.zotero.org/discussion/comment/461140/#Comment_461140
(3)(+0000078): Got MIME type false from extension 'djvu'

(3)(+0000002): Cannot determine MIME type from magic number or extension -- settling for application/octet-stream

(3)(+0000037): Cancelling
Debug ID: D2140447598
Zotero 7.0.3-beta.1+2065a60b7 (64-bit)
Windows 10

As reported in my previous post, adding exactly the same file to a new item does not produce the problem anymore.
I have around 100 files showing the problem. Is there any way to fix the problem without re-adding them manually?

Zotero 7.0.3-beta.1+2065a60b7 (64-bit)
Windows 10
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