WPT details: https://wpt.fyi/results/storage-access-api/requestStorageAccess-dedicated-worker.tentative.sub.https.window.html (Note that Chrome doesn't properly block third-party cookies when running WPTs for wpt.fyi, so these test results don't reflect Chrome's actual behavior when third-party cookies are blocked.)
Dedicated workers will inherit the "storage access status" of the parent context. I.e., if a document obtains storage access via `document.requestStorageAccess` and then creates a dedicated worker, the worker will also have storage access (and be able to access unpartitioned cookies).