Create a content selector privilege with the following criteria:
format == maven2
Assign this to a content selector privilege, and grant all actions.
A user with this privilege assigned cannot perform staging operations, it always fails with unauthorized.
Granting this same user the the "nx-repository-view-maven2-<repoId>-delete" privilege in the source repository, and the "nx-repository-view-maven2-<repoId>-add" privilege in the destination repository works without issue.