[Webkit-unassigned] [Bug 245614] New: Safari forgets first-party interaction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245614

            Bug ID: 245614
           Summary: Safari forgets first-party interaction
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: r+webkit at mko.re

I'm the provider of an iframe-embedded app that relies on (third-party) cookies. I use ITP for ensuring I have storage access. Even though hasStorageAccess() returns true, I detect cookies are not persisted.
This happens because of the old WebKit "you need to have had first-party interaction before third-party cookies works" (see e.g. 218396). 
Letting the user do first-party interaction indeed solves the problem.

However, Safari (15.6.1) seems to forget the first-party interaction on every browser restart (even if the first party interaction was only minutes earlier). 
This means the user needs to go through the entire first-party interaction every time they start their browser, which is obviously time consuming.
Is this expected? I have the impression that this is relatively recent?

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