var fn = acf.findFields({key:'field_633dabc3c27a4'}); // or getFields({key:'field_633dabc3c27a4'});
var fk = acf.getField('field_633dabc3c27a4');
console.log(fn[0]);
console.log(fk);
Should return the same object, surely?
Why does getField return a valid jQuery object and findFields()[0] just return a DOM element, to which nothing can be done?
I suspect this is a bug.
I don’t have an answer for you.
Have you tried console.log(fn)
to see how the entire thing is returned?