There was inconsistency between backports_required_for_multiversion_tests.yml and bucket_unpacking_with_sort.js in BACKPORT-21214 (https://github.com/10gen/mongo/commit/61349ca0484b4e7cd6fc8e0410f1c4b14d27d371).

New test cases in bucket_unpacking_with_sort_negative.js of the original patch were moved into bucket_unpacking_with_sort.js as bucket_unpacking_with_sort.js was divided into several test files in recent branches but backports_required_for_multiversion_tests.yml mistakenly excluded bucket_unpacking_with_sort_negative.js which does not exist in v7.0 branch.

The issue occurs only in v7.0