RemoveSnapshotsTask has threading issues and incorrectly processes npm repositories

Nexus 3.3.1 was configured with two Snapshot removal tasks that started at the same time:

See attached text file for play-by-play.

Problems

• quartz-1-thread-11 task is only configured to process agfa-snapshots but logs it is also processing orbis-snapshots:
  2017-06-17 03:00:00,141+0200 INFO [quartz-1-thread-11] *SYSTEM org.sonatype.nexus.repository.maven.internal.RemoveSnapshotsFacetImpl - Removing snapshots on repository orbis-snapshots with configuration: org.sonatype.nexus.repository.maven.tasks.RemoveSnapshotsConfig(2, 7, true, 365)
• the ending task thread is clearly processing *npm* assets when it should only be processing Maven repositories
• one of tasks times out and fails performing a query - the other one takes an extremely long time with very little progress logging.