Gitlab Pack project column doesn't support nested groups

In a custom table with a Gitlab project column, I can’t add an url in the form of https:/gitlab.com/Group/SubGroup/Project.
The column displays Received an invalid project URL. I tried to fake the validation by setting https:/gitlab.com/Group%2FSubGroup/Project but in this case I had another error Couldn't find this data in GitLab
Did someone successfully added a nested group project ?

Thanks