Just to add that the problem is still present today on:
$ LANG=C guix describe
Generation 5 Nov 04 2019 14:24:15 (current)
guix bf7b08c
repository URL:
https://git.savannah.gnu.org/git/guix.git
branch: master
commit: bf7b08c4fe7d14c25a83bde99f19eca1119d88ff
Also, I was able to use the drive successfully from a Trisquel 8 Live USB stick. So, at least I know the drive works.
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https://sirgazil.bitbucket.io/