Uninitialized scalar field

The field will contain an arbitrary value left over from earlier computations. A scalar field is not initialized by the constructor
/src/mongo/db/modules/enterprise/src/fle/query_analysis/aggregate_expression_intender.cpp:1075: UNINIT_CTOR 115592 Class member declaration for "numChildrenVisited".
/src/mongo/db/modules/enterprise/src/fle/query_analysis/aggregate_expression_intender.cpp:904: UNINIT_CTOR 115592 Non-static class member "numChildrenVisited" is not initialized in this constructor nor in any functions that it calls.