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Disposing the Hub with AutoSessionTracking gives an error

See original GitHub issue

As observed on Unity, when you dispose of a hub and usingAutoSessionTracking, an error will be thrown once the SDK disposes of the SDK hub. You can reproduce the error with the following snippet:

void StartSentry()
{
    SentrySdk.Init(o =>
    {
        o.Dsn = "https://eb18e953812b41c3aeb042e666fd3b5c@o447951.ingest.sentry.io/5428537";
        o.AutoSessionTracking = true;
        o.CacheDirectoryPath = "C:/Users/.../AppData/LocalLow/Sentry/Sentry Defenses/Sentry";
        o.Debug = true;
    });
}
StartSentry();
StartSentry();
Console.ReadKey();

The following error was received:

Error: Failed to send cached envelope: C:/Users/lucas/AppData/LocalLow/Sentry/Sentry Defenses/Sentry\Sentry\132A73C90BBA506000857BC4BFC23E574F1551B5\__processing\1638992610_1647__6590935.envelope, retrying after a delay.
System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at Sentry.Internal.Extensions.StreamExtensions.ReadAllBytesAsync(Stream stream, CancellationToken cancellationToken)+MoveNext() in D:\Development\Online Projects\Sentry\sentry-dotnet\src\Sentry\Internal\Extensions\StreamExtensions.cs:line 18
   at Sentry.Internal.Extensions.StreamExtensions.ReadAllBytesAsync(Stream stream, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
   at Sentry.Protocol.Envelopes.Envelope.DeserializeHeaderAsync(Stream stream, CancellationToken cancellationToken) in D:\Development\Online Projects\Sentry\sentry-dotnet\src\Sentry\Envelopes\Envelope.cs:line 188
   at Sentry.Protocol.Envelopes.Envelope.DeserializeHeaderAsync(Stream stream, CancellationToken cancellationToken) in D:\Development\Online Projects\Sentry\sentry-dotnet\src\Sentry\Envelopes\Envelope.cs:line 188
   at Sentry.Protocol.Envelopes.Envelope.DeserializeAsync(Stream stream, CancellationToken cancellationToken) in D:\Development\Online Projects\Sentry\sentry-dotnet\src\Sentry\Envelopes\Envelope.cs:line 212
   at Sentry.Internal.Http.CachingTransport.InnerProcessCacheAsync(String envelopeFilePath, CancellationToken cancellationToken) in D:\Development\Online Projects\Sentry\sentry-dotnet\src\Sentry\Internal\Http\CachingTransport.cs:line 195
   at Sentry.Internal.Http.CachingTransport.InnerProcessCacheAsync(String envelopeFilePath, CancellationToken cancellationToken) in D:\Development\Online Projects\Sentry\sentry-dotnet\src\Sentry\Internal\Http\CachingTransport.cs:line 207
   at Sentry.Internal.Http.CachingTransport.ProcessCacheAsync(CancellationToken cancellationToken) in D:\Development\Online Projects\Sentry\sentry-dotnet\src\Sentry\Internal\Http\CachingTransport.cs:line 159  Debug: Background worker of CachingTransport has shutdown.