Laravel 8 - how to keep radio "checked" fields visible after `validate()` refresh?

Question

I have a form with "Does this case have IR number?"
If yes, show fields. If no, hide and show others.

I am using

• validate() function.
• old() to keep data after failed form submission, aka validate() error messages.
• JQuery show/hide for the fields.

For the radio input, I used old() like this:

<input class="btn-check" type="radio" name="checkIR" value="haveIR" @if(!old('checkIR')) checked @endif id="haveIR" required>
<input class="btn-check" type="radio" name="checkIR" value="noIR" @if(old('checkIR')) checked @endif id="noIR">

to keep the checked as it is after failed validate(), but it's buggy, When I check "Yes" and refresh, it checks "No" when it must be as "Yes".

As for the show/hide, here is what I did:

// Show/Hide fields based on radio button option
    $(document).ready(function() {
        $('input[name="checkIR"]').click(function() {
            var inputValue = $(this).attr("value")
            var targetField = $("." + inputValue);
            $(".box").not(targetField).slideUp();
            $(targetField).slideDown();
        });
    });

With a help of css:

.box {
  display: none;
}

How the code works:
If yes/haveIR radio is checked: show all fields containing class="box haveIR"

Issues trying to solve:

• How to fix/improve the small bug in the input old()?
• If user checked "yes", how to keep the fields of yes visibile even after failed laravel validate()?