Our shard Merge implementation + it's related unit & js tests are located in the community repo but depends on enterprise-only feature, like, backup cursor. If we run those tests on a non-enterprise build variant, those tests would fail.

Currently the shard Merge implementation is behind a feature flag. And, we run all feature flags enabled only on enterprise-only build variants. However, we are safe now as we don't run shard merge tests on non-enterprise build variant. But, once we enable the shardMerge flag, we would start seeing test failures w/ error message -

 "Unrecognized pipeline stage name: '$backupCursor'"