Share Content Pack with Security Group not possible? (bug?)

I've created a Content Pack with some Power BI Reports but when I try to share it with a Security Group that doesn't seem to work: It says it's succesfully shared and it does appear for the group's users under "Get Data", but when they get the pack no reports are added to their Workspace and the next time I view my Content Pack the Security Group is no longer in the list of who has access. It very much seems like a bug? It says here that you should be able to share to Security Groups (read 3.a):

https://powerbi.microsoft.com/en-us/documentation/powerbi-service-organizational-content-pack-tutorial-create-and-publish/