[Webkit-unassigned] [Bug 274310] New: Strange mix of content from two websites loaded simultaneously

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=274310

            Bug ID: 274310
           Summary: Strange mix of content from two websites loaded
                    simultaneously
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pmusaraj at gmail.com

This is hard to describe, I'll do my best, but happy to clarify further if there are questions. 

I have Webkit (Safari on macOS) as my daily driver, and in my usage, I am often on two websites that are built using the same underlying web stack. The app is Discourse, so in my day-to-day I'm often switching between alpha.discourse.org and beta.discourse.org. Since 2-3 months ago, I have noticed an issue when clicking links or navigating using back/forward actions between the two sites: the content of the page gets mixed between the two properties. Some assets like avatars, site logo will be loaded from the alpha site, but other elements will be loaded from the beta site. The address bar URL also gets corrupted, it doesn't go to the right location. 

This has been reproduced by multiple colleagues on: 

- Safari desktop macOS (latest version of Safari and the OS as of writing)
- mobile Safari on iOS
- Safari in a webview in iOS
- no repro on non-Webkit browsers

If it's related, there is also an issue navigation to other properties. This is intermittent, but sometimes a link to a Github repository will get stuck in a loading state indefinitely. The browser will start loading the page, but it won't complete it. (I have been mentally forcing myself to open all github links in new tabs to avoid this, but sometimes I forget...)

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