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BugZero found this defect 2716 days ago.
If a sharded collection is dropped when a chunk in it has been scheduled for deletion, any listeners are sometimes not notified.
xgen-internal-githook commented on Fri, 12 May 2017 20:44:24 +0000: Author: {u'username': u'nathan-myers-mongo', u'name': u'Nathan Myers', u'email': u'nathan.myers@10gen.com'} Message: SERVER-29156 Notify range-delete listeners when table drops Branch: master https://github.com/mongodb/mongo/commit/a1764c5906ff2c6a1e16fddb843dbf17bc4a5faa