This blog post covers enhancements to Intelligent Tracking Prevention (ITP) included in Safari on iOS and iPadOS 13.3, Safari 13.0.4 on iOS, MacSafari 13.4, and High Sierra 13.1.4. The Storage Access API takes Safaris cookie policy into consideration when handling calls to document.hasStorageAccess(). All third-party requests without prior user interaction will now be blocked from seeing their cookies, regardless of the classification status of the third party domain.”]
Source: https://webkit.org/blog/9661/preventing-tracking-prevention-tracking/