I can reproduce this bug in
$ 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 Programs affected: GIMP 2.10.12 Pencil2D 0.6.4 Scribus 1.5.5 --- https://sirgazil.bitbucket.io/
