internal sealed unsafe class UnsafeStream(void* unmanagedMemory) : Stream
{
    private readonly void* _unmanagedMemory = unmanagedMemory;

    //                             ↓↓↓ RCS1229: Use async/await when necessary
    public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
    {
        // try is required to trigger it
        try
        {
            var tcs = new TaskCompletionSource<int>();

            // Do stuff with _unmanagedMemory that will run async and use the TCS to complete the returned task

            return new ValueTask<int>(tcs.Task);
        }
        catch
        {
            throw;
        }
    }
}