Importing new project from an authenticated Git repository fails with error

We have a project kept in our Git repository, where all our users have to use authentication. We use JBPM Workbench 7.9.0.Final, and everything works well. Started a migration to the lastest version of JBPM and starting with 7.11.0.Final we can't import our project to a vanilla Workbench instance because it always says:

Caused by: org.eclipse.jgit.errors.TransportException: https://git-host:5002/scm/git/ourproject/ourproject-workflow: not authorized

I start the import process with the import dialog filling the url, user name and password fields, then hit Import. I get the Project list, where I can choose our project to be imported. Then I hit the Ok button, an receive the error.

Attached a screenshot of the error on the Workbench UI, and a stacktrace as well.

The problem was tested with jbpm-workbench-showcase Docker images.