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Because FreeBSD is behind Linux in copying with reflinks. They couldn't even reproduce the issue if they wanted to.

This code was implemented for FreeBSD before it was implemented for Linux. I do not think it has made it to a FreeBSD release yet though.

It’s in FreeBSD 14. But they disabled block cloning by default.

This hit Linux first, which is why Linux experienced the issue. FreeBSD does not currently have reflink cp.