Reinitialize or reload a dynamic Tagify element

I have an mvc view which generates dynamic text inputs, based on the number of records needing to be edited.  

<input asp-for="@Model[i].CUSTOM_TAG" class="cust" type="text" data-custom="" />

Select allOpen in new window

Each text input is put through the Tagify process, to make them all Tagified.  
 
Jquery version

var cust = $(".cust");
jQuery.each(cust, function (i, val) {
   var tagify = new Tagify(cust[i], {
         delimiters: ",",
         editTags: false,
         dropdown: {
             enabled: 0,
             maxItems: 5
         }
   });
});

Select allOpen in new window

Javascript version

document.querySelectorAll(".cust").forEach(node => {
   new Tagify(node, {
      delimiters: ",",
      editTags: false,
         dropdown: {
            enabled: 0,
            maxItems: 5
         },
   });
 });

Select allOpen in new window

Both versions work as expected.  Except I have a use case where if we have many text inputs that require the same values, the user should only need to enter them once.  So I wired the first text input row to include a button that copies the values in this first text input into all following text inputs.

$(".copy_cust").click(function () {
   var parent = $(".first");
   var val = parent.children("*[data-custom]").val();
   $("*[data-custom]").val(val);
});

Select allOpen in new window

This also works as expected.  If I placed AAA and BBB in the first input, the first and all following inputs now have "[{"value":"AAA"},{"value":"BBB"}]".  The first has the Tagified values that look like tags:   [ AAA ] [ BBB ].  

But all other inputs have nothing visible.  If I f12 and view the elements, I can see the copied values are there for all inputs.   But I cannot for the life of me figure out how to get Tagify to render the new input values.  I posted a help comment with the developer and his response was the following:

“Tagify has no notion you updated the value of the input tags programmatically.  You need to run tagify.loadOriginalValues() where tagify is a variable referencing new Tagify for each of your tagified inputs.  This will rebuild the tags to match the value.”

And here is where I'm stumped.  I have tried everything I can think of to reach each instance of a tagified input with zero luck.

var child = $("*[data-custom]");
var tag = $(child[1]).tagify();
var tag = Tagify(child[1]);
etc...

Select allOpen in new window

I have tried so many variations, I can’t even recall them all.  I get either
 
 “tagify is not a function”
 “this element is already a tagified element”
 ‘undefined”
 
If you can steer me in the right direction, that would be amazing.   =]
Thank you in advance.