Google tells me that this is or was a problem with openssh. Maybe this is fixed in later versions.

Does the same work when using plain scp from the command line?

In reply to Re: How to use -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null in Net::SCP::Expect by Corion
in thread How to use -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null in Net::SCP::Expect by aneeshk

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