Fixes #4792 (#4793)

Co-authored-by: Tom Clune <thomas.l.clune@nasa.gov>
Co-authored-by: Matt Thompson <matthew.thompson@nasa.gov>

Author: 3 people

generic3g/specs/ExpressionClassAspect.F90

@@ -119,6 +119,7 @@ subroutine create(this, other_aspects, rc)
       integer :: status
 
       this%payload = ESMF_FieldEmptyCreate(name='expression', _RC)
+      call mapl_FieldSet(this%payload, allocation_status=STATEITEM_ALLOCATION_CREATED, _RC)
 
       _RETURN(ESMF_SUCCESS)
       _UNUSED_DUMMY(other_aspects)