Missing versionable path property for oak:mount-libs-crx.default

After applying the OAK-3777, following warning can be found in the logs:

21.07.2017 02:00:00.713 *WARN* [sling-default-999-HourlySnapshotJob] org.apache.jackrabbit.oak.plugins.version.ReadOnlyVersionManager Missing versionable path property for oak:mount-libs-crx.default at /jcr:system/jcr:versionStorage/5e/8d/89/5e8d8989-f86b-4e1b-b7f8-5089c44f5ed7
21.07.2017 02:00:00.713 *WARN* [sling-default-999-HourlySnapshotJob] org.apache.jackrabbit.oak.security.authorization.permission.CompiledPermissionImpl Cannot retrieve versionable node for /jcr:system/jcr:versionStorage/5e/8d/89/5e8d8989-f86b-4e1b-b7f8-5089c44f5ed7/1.0/jcr:frozenNode

It suggests that somehow the name of the new permission store (oak:mount-libs-crx.default) is being used as the workspace name for the version storage.

If I understand correctly, it shouldn't happen. The workspace name is sometimes used as the name of the permission store node (eg. /jcr:system/rep:permissionStore/crx.default), but not the other way around - the name of the permission store node is not always a valid workspace name (eg. /jcr:system/rep:permissionStore/oak:mount-libs-crx.default)

//cc: stillalex