Custum cookies deleted after redirect

Hello all,

I’m experiencing some troubles with custom cookies in combination with cookie consent enabled.

I’ve built a form with Formidable Forms Pro to receive subscriptions and payments for a sports camp. To generate some documents or do some error handling i’m setting a custom cookie with next snippet of code:

<script src="https: (Email address hidden if logged out) /dist/js.cookie.min.js"></script>
<script type="text/javascript">
function entryID(){
	let timeStamp = Date.now();
	console.log('timeStamp:', timeStamp);
	document.getElementById("field_entry_unique_id").value = timeStamp;
	Cookies.set('entry_unique_id', timeStamp, { expires: 1 })
}
</script>

When I watch the DevTools, the cookie is set correctly with the correct value and lifetime of one day.

After finishing payment through a payment service provider, the customer returns to the corresponding page (success, error, cancelled).

On the pages “error” and “cancelled” i’m using next snippet of code to read the cookie:

<script src="https: (Email address hidden if logged out) /dist/js.cookie.min.js"></script>
<script type="text/javascript">

let entryID = Cookies.get('entry_unique_id');
console.log('Cookie entryID:', entryID);
<do other stuff>

And there comes the catch: With the cookie consent disabled everything works as expected and the cookie can be read.
However, with the cookie consent enabled, the cookie “entry_unique_id” gets deleted upon returning after the PSP returns the status of the payment.

Things I tried is: adding the custom cookies to the cookie modal window (didn’t help) and adding the cookie to the essential cookies in avia-snippet-cookieconsent.js at line 489 and 493 (no success either).

What am I doing wrong / how can I fix this?

Enfold: 5.3.1.1
PHP: 8.0.27
Browser: Microsoft Edge, Version 108.0.1462.76