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/exec/timeseries/bucket_unpacker.h:233: UNINIT_CTOR 137900 Class member declaration for "_closedBucket".
/src/mongo/db/exec/timeseries/bucket_unpacker.cpp:455: UNINIT_CTOR 137900 Non-static class member "_closedBucket" is not initialized in this constructor nor in any functions that it calls.