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/