addEventListener being overridden in Customer Events, and breaking some tracking scripts

[SGSdev]

I've noticed that with certain scripts added to Customer Events - Custom Pixels (in my case an Amazon AWS script), the execution will fail and I will see this error in the console: "In a sandboxed environment, addEventListener may not behave as expected.". It looks like the native addEventListener function has been overridden by a custom Shopify function that displays this error message. I understand that people shouldn't be trying to add event listeners to the DOM in a sandbox environment, but sometimes addEventListener is used for XHR requests and other things related to data transmission. I'd like to request that Shopify update this so that a warning message is displayed without actually breaking the functionality of addEventListener, so that it doesn't disrupt data tracking. Thanks.

[Liam]

Hi SGSdev,

What exact component is the event listener being added to? If it's on a checkout that is using checkout extensibility then `addEventListener` will not work as these functions are intentionally limited to ensure the checkout remains secure. 

[Zakaria]

I am running into the same issue on mobile when doing this: `window.addEventListener("load", () => {})` in a web component injected by a theme app extension. On desktop everything seems to be working fine though.