When importing a space using:

https://<sitename>.atlassian.net/wiki/admin/importspace/importconfluencespace.action

Once the import is complete users that have content (page, drafts, likes, comments, etc.) in the space are added to the site and show in the admin.atlassian.com management portal as having site access.

Previously this was not the case and the users would simply show as unlicensed.

An option to choose whether or not to import users during the Space Migration would be beneficial.