I upgrade from 4.8.9 to 4.20.0 (Pro version), and the chips stopped working. The documents for JS usage are still the same at https://mdbootstrap.com/docs/b4/jquery/javascript/tags/#javascript-usage, but running my code is according to the docs, yields an error in the console:

jquery-3.6.0.min.js:2 jQuery.Deferred exception: $(...).materialChip is not a function TypeError: $(...).materialChip is not a function

indicating that the chip functions are not available at all.Removing clutter from my script, the the essential part that is being called on my page is:

<script>
$(function() {
    $('.chips-initial1').materialChip({data:[]});

    registerChipDelete(1);
    registerChooseItem(1);
});
</script>

I do not see an issue with the inclusion of the .js files in my page, either (they're according to the example in index.html in the MDB package)