ACS commons nested multifield validation

I’m using aem 6.2 and for the Multifield I’m using following ACS commons nested multifield and I’m able to save multifield data in JSON way. I've wrote a listener on dialog but when I try to get the value of multifield fields on dialog save, the field value just disappears in debug mode and don’t get any value. However, if I don’t use acs commons multifield approach then logic on dialog save works fine and able to get the value. Please lemme know if there’s any workaround that I can use the acs commons nested field and still get the values of it on dialog save. Thanks