Just to add a voice to this: we see the same things migrating from 18.04 to 22.04 while controlling some embedded ARM/Debian devices running dropbear. The key are indeed appearing in the wrong place as stated above and the log in does not proceed as expected. We can work around this for production systems, but the behaviour is confusing (and obviously not consistent between 18.04 and 22.04).
Just to add a voice to this: we see the same things migrating from 18.04 to 22.04 while controlling some embedded ARM/Debian devices running dropbear. The key are indeed appearing in the wrong place as stated above and the log in does not proceed as expected. We can work around this for production systems, but the behaviour is confusing (and obviously not consistent between 18.04 and 22.04).