Fix volumetric derivatives

created branch 101-fix-volumetric-derivatives to address this issue

By jonathan.froehlich on 2021-12-03T14:09:13 (imported from GitLab)

mentioned in merge request !117 (merged)

By jonathan.froehlich on 2021-12-03T16:21:35 (imported from GitLab)

mentioned in commit 27e1eda6

By jonathan.froehlich on 2021-12-03T16:36:23 (imported from GitLab)

closed