Process with a pv!ID of type number, a paramter and marked required true but still the process is working despite no value from its parent for that required pv

So I have a parent process in which 1 subprocess is mapped and in that subprocess there is 1 pv!id of number type and set as a parameter and is required true but I’m not passing it from parent process, in spite not passing it is going ahead without giving any error but it should give error because of required variable not being passed!