Nitrokey 3 SSH and FIDO2 - key names?

Thanks to an instructive article in a recent c’t Tipps zur Optimierung Ihres SSH-Workflows (paywall) I’m playing with my FK3, ssh-keygen and Chrome.

I ran into a problem with the proposed ssh-keygen commandline:

ssh-keygen -t ed25519-sk -f /home/user/.ssh/fido2-cttest.ed25519-sk \
    -O resident -O verify-required

I can see the generated key in chrome://settings/securityKeys. But when I run

ssh-keygen -t ed25519-sk -f /home/user/.ssh/fido2-cttest.ed25519-sk \
    -O resident -O verify-required

to generate a second key, there is still only one key visible in Chrome:
Chrome-security-key-sign-in-data
I found no argument to ssh-keygen that could change any of the three fields.

Is this a deficiency of Chrome or a feature missing from ssh-keygen? Or am I just not able to find the right knob?

Found it at Yubikey. You have to give the keys differring names with a command like this:

ssh-keygen -t ed25519-sk -f /home/user/.ssh/fido2-cttest2.ed25519-sk \
    -O resident -O verify-required -O application=ssh:host2