$geoNear queries can specify a $geometry operand without having to specify a type. This is partially because $geoNear expects a geometry of type "Point" at all times. While we may add a consistency check on the type in the future, for now we simply want to allow this type of query to re-parse correctly. This means that we should handle cases where the "type" passed in is also invalid as is the case for this BF.

In this case:

"type": 'b.c'