How is the «Update» button implemented for a billing address dialog inside a payment method form on the frontend checkout page?

Development Payment
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Magento_Checkout/js/view/billing-address::updateAddress()

Magento_Checkout/js/action/select-billing-address

Magento_Checkout/js/model/quote::billingAddress

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See also:

3

Hello,
I am getting this javascript string inserted into my billing address when I hit update in the checkout (magento 2.3.4).

function e(F,E){var D=0;try{this._each(function(H){F.call(E,H,D++)})}catch(G){if(G!=$break){throw G}}return this}, function y(G,F,E){var D=-G,H=[],I=this.toArray();if(G<1){return I}while((D+=G)<I.length){H.push(I.slice(D,D+G))}return H.collect(F,E)}, function d(F,E){F=F||Prototype.K;var D=true;this.each(function(H,G){D=D&&!!F.call(E,H,G);if(!D){throw $break}});return D}, function o(F,E){F=F||Prototype.K;var D=false;this.each(function(H,G){if(D=!!F.call(E,H,G)){throw $break}});return D}, function p(F,E){F=F||Prototype.K;var D=[];this.each(function(H,G){D.push(F.call(E,H,G))});return D}, function A(F,E){var......

Any idea how to fix that?

Thanks