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/query/fle/server_rewrite.h:210: UNINIT_CTOR 122052 Class member declaration for "_rewroteLastExpression".
/src/mongo/db/query/fle/server_rewrite.h:190: UNINIT_CTOR 122052 Non-static class member "_rewroteLastExpression" is not initialized in this constructor nor in any functions that it calls.