8 posts were split to a new topic: 2.0.8.1 update may request SSH/SFTP ssh-ed25519 host key reverification
EDIT 1:
If you see message that ssh-ed25519 32 host key has changed to an ssh-ed25519 256, with values to the right staying the same, this was a bug fix in SSH.NET to now display key’s length in bits, not bytes.
Technical discussion is available at the link above so that the release note can just summarize the result.
EDIT 2:
Replicating an unrelated-to-SSH answer that moved away while moving away the detailed SSH thread: