Unable to decrypt RSA SSH key when importing

I'm trying out the new SSH key management + SSH agent and I'm having an issue importing an old RSA key with a passphrase. The same import worked for my ed25519 key with the same passphrase. I verified the passphrase worked for the key in question:


➜ ssh-keygen -y -f .ssh/id_rsa
Enter passphrase:
ssh-rsa AAAAB3NzaC1yc2...
~ took 3s
➜ echo $status
0


I'd be happy to debug; I'd love to have all my keys in 1Password and have everything set up with the SSH agent.

Thanks!

1Password Version: 8.6.0-51
Extension Version: 2.3.1 (beta, Firefox)
OS Version: Regolith (Ubuntu)