Comment 11 for bug 1670745

@Gautier - thanks for trying to verify - I'm currently doing the same.
The known_hosts file you have still has the broken content.
The fix cannot change your existing known_hosts file to be good.
You'd have to remove the broken lines and add them again with ssh-keyscan.
But the fix in keyscan is in a way that now it should create valid entries that work.

So when you rescan your target afterwards and appand that to your known hosts it will be good then.