Have you resolved this issue? I'm also encountering this problem now and don't know how to solve it.
junxiao
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My app update was also rejected because of this.
We had the same problem, we couldn't download DSYM files in the background of App Store Connect.
After I updated another version a few days ago, the number of crashes in the App Store Connect background dropped a lot, and Xcode-Window-Organizer-Crashes did not show this crash.