bug#68478: Guix System: pcaudiolib-1.1 expected string `Derive(['

[Daniel Khodabakhsh]

Have a Guix System with minimal modifications (just added the
spice-vdagent service because I'm using this in QEMU).
In the latest `guix pull` + `sudo guix system reconfigure
~/configuration.scm`. I get the following error:

guix system: error: error parsing derivation
`/gnu/store/4xz1998qw8niax3pi0lsbwxfl7dfrpil-pcaudiolib-1.1-checkout.drv':
expected string `Derive(['

Tried running `guix gc` but this didn't fix it.
Is this an issue with my system? Or an issue with the package itself?