Consider the following example running the classic engine:

> db.c.insert({b: 1})
> db.c.find({a: {$gt: MinKey()}})
{b: 1}

Because the `a` field is missing in the document, it is implicitly `null` for the purposes of evaluating `a > MinKey()`. Because of BSON ordering semantics, `null` is greater than `MinKey()`, and results in the document being matched.

When SBE (featureFlagSbeFull) is enabled, the server incorrectly omits this document.