The implementation of QueryPlannerIXSelect::stripInvalidAssignmentsTo2dsphereIndices filters version 2 2dsphere indexes (as they are sparse).

However, version 3 of these indexes are not filtered. As a result, they can be selected as a winning plan and documents not in the index cannot be found.

It should be noted that filtering these indexes out may result in a collection scan which will find documents but at the cost of poor performance.