Zend certified PHP/Magento developer

Checkout Page issue after upgrading magento from 2.3.5 to 2.4.4

Could anybody help me please? I updated a website in Magento from version 2.3.5 to 2.4.4, but my checkout page has an issue. This page shows “Something went wrong with your request. Please try again later.”. I can see in my browser console some alerts with 404 not found message and in those urls I see “undefinedrest”; I think this one is the cause for my issue in the checkout page. Maybe does anybody know how I can solve this issue please?

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This is my system.log, but I don´t know if those messages are related with my checkout page issue

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I appreciate your help, I’ve worked a lot to try to solve this issue, but I can’t find any solution. Thanks.