Nested source null check calls method twice instead of using intermediate variable #2245

@Mapper
public interface TestMapper {
    class Tenant {
        public String id;
    }
    class Inner {
        public String id;
    }

    class TenantDTO {
        public Inner inner;
    }

    @Mapping(target="id", source = "inner.id", defaultValue = "test")
    Tenant map(TenantDTO tenant);

}

if ( tenantInnerId( tenant ) != null ) {
    tenant1.id = tenantInnerId( tenant );
}
else {
    tenant1.id = "";
}

String id = tenantInnerId( tenant );
if (  id != null ) {
    tenant1.id = id;
}
else {
    tenant1.id = "";
}