[Webkit-unassigned] [Bug 248719] New: Files written to OPFS through a sync access handle in Safari are read back out with a size of zero bytes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248719

            Bug ID: 248719
           Summary: Files written to OPFS through a sync access handle in
                    Safari are read back out with a size of zero bytes
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Website Storage
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nathan at shareup.app
                CC: sihui_liu at apple.com

After closing the sync access handle, reading a file from OPFS with `getFile()` always returns a `File` of size zero.

I've create a gist with file to reproduce the problem. The example in the gist works in Chrome, the file contents can be read back out after the sync access handle is closed.

See https://gist.github.com/myobie/021fc07f09e013b1e5c137ec09282aeb

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