Cannot select/import pgp key with elgamal subkey

Setup is keybase go client on mac osx installed via homebrew.

air:~ andre$ keybase version
Client:  1.0.7-0
Service: 1.0.7-0
air:~ andre$ gpg --version
gpg (GnuPG/MacGPG2) 2.0.28
libgcrypt 1.6.3

I got this key in my keyring:

air:~ andre$ gpg -K
/Users/andre/.gnupg/secring.gpg
-------------------------------
sec   1024D/BBCDCEFB 2005-11-23
uid                  Andre Geddert <andre@geddert.net>
uid                  Andre Geddert <andre.geddert@networklabs.de>
ssb   2048g/D4196920 2005-11-23

Try to select it:

air:~ andre$ keybase pgp select
#    Algo    Key Id             Created   UserId
=    ====    ======             =======   ======
1    1024D   866D78C2BBCDCEFB             Andre Geddert <andre@geddert.net>, Andre Geddert <andre.geddert@networklabs.de>
Choose a key: 1
▶ INFO Bundle unlocked: 866D78C2BBCDCEFB
▶ ERROR key generation error: k.ToLksSKB() error: openpgp: invalid argument: unknown private key type

same problem with import command:

air:~ andre$ cat Desktop/BBCDCEFB.asc | keybase pgp import
▶ ERROR k.ToLksSKB() error: openpgp: invalid argument: unknown private key type

Debug from above command attached:
debug.txt

Start by reproducing the failure with the provided GnuPG key using keybase pgp select and keybase pgp import, then read the attached debug.txt around the k.ToLksSKB() error. Trace how the client handles the ElGamal private subkey and verify that both selection and import complete without the unknown private key type error.