Hello Jack,
Thanks a lot for your reply! I think it was an issue with the build. I used a fenics 2019.1.0 docker image with SHA256 : f99661bca19762194d64c9fdf7ba341490bed9c6eb508c5ea37fb25febb5378d .
I pulled a newer image and then it worked as expected!
(Should’ve updated it here! My bad!)
Cheers.