Preview "breaks" my pdf files

I am working on a remote directory, mounted with sshfs. I create pdf files in this directory with pdflatex.
Whenever I open a pdf file (made with pdflatex) using preview, it creates a dot-underscore file that is apparently "broken:"
If I close preview, then try to reopen the file again, preview says "file.pdf is damaged and can't be opened. You should move it to the trash".
However, if I delete the dot-underscore file, I can open the file fine with preview (although it will again create a "broken" dot-underscore file).
I should note that the pdf files I create can be read just fine by all types of viewers - they are for a class I teach and students read them with all sorts of devices and operating systems.
Thanks for any advice.

You can delete the attributes in the Terminal with:
xattr -d com.apple.quarantine filename
Or from a whole directory with:
xattr -dr com.apple.quarantine diretoryName
I'm not sure why Preview is adding these to existing files. There are loads of pages about how Apple's quarantine system works, though.

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Preview "breaks" my pdf files

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