Having a problem populating a field on the ThankYou page

On form 60898267714974 I have client side block:

<li class="form-line always-hidden" data-type="control_textbox" id="id_28">
    <label class="form-label form-label-top form-label-auto" id="label_28" for="input_28">  </label>
    <div id="cid_28" class="form-input-wide always-hidden jf-required">
        <input type="text" class=" form-textbox" data-type="input-textbox" id="input_28" name="url" size="20" value="http://localhost:3538" />
    </div>
</li>

I'm trying to get the value of the input named 'url' to display on the thankyou page in the {url} block but it's coming up blank.

I have tried setting the URL value as the default in the field properties.

As I tried to submit the form, I see that the Thank you message is displaying the URL value normally.

Could you let us know how the value of the URL is being filled in or prepopulated? This would help us in checking the issue further.