ed25519 ssh key issues?

[jungle Boogie]

Hi All,

After updating to the latest amd64 snapshot, my ssh keys no longer work on
a host with a different snapshot (from Sunday).

Load key "/home/jungle/. ssh/id_ed25519": invalid format

My keys on both hosts have not changed in months.

I cannot connect to the remote end at all and can't upgrade it to the
latest snapshot see if that fixes it.

Any suggestions?

Thanks!