dev-vcs/gitlab-gitaly-1.20.0:0 have the same problem with netsandbox. Review bug #680598
Jeroen Roovers thanks for your review. This ebuild is from gitlab overlay.
Fixed in https://gitlab.awesome-it.de/overlays/gitlab/commit/85dabbd17a44649e3a797b352e10a7c4f0f54d49