ERROR key generation error: Unknown signature subpacket: 34 (error 905)

please fix this

```
[caio@archlinux ~]$ keybase pgp select
You are selecting a PGP key from your local GnuPG keychain, and
will publish a statement signed with this key to make it part of
your Keybase.io identity.

Note that GnuPG will prompt you to perform this signature.

You can also import the secret key to *local*, *encrypted* Keybase
keyring, enabling decryption and signing with the Keybase client.
To do that, use "--import" flag.

Learn more: keybase pgp help select

# Algo Key Id Created UserId
= ==== ====== ======= ======
1 255? 9BD364D8FE415534 caio
2 4096R F475B1926F1315E1 caio
Choose a key: 2
▶ ERROR key generation error: Unknown signature subpacket: 34 (error 905)
```

Start by reproducing the failure with `keybase pgp select` and the affected local GnuPG key. Investigate how the client handles the reported unknown signature subpacket 34, then verify that selecting the key completes without error 905.

Written by the indexing model from the issue text.