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NullReferenceException in Avalonia.Media.MediaContext.CommitCompositor

See original GitHub issue

Describe the bug NullReference in Avalonia.Media.MediaContext.CommitCompositor:

partial class MediaContext
{
    private bool _scheduleCommitOnLastCompositionBatchCompletion;
    
    private Batch CommitCompositor(Compositor compositor)
    {
        var commit = compositor.Commit();
        _requestedCommits.Remove(compositor);
        _pendingCompositionBatches[compositor] = commit;
        commit.Processed.ContinueWith(_ =>
            Dispatcher.UIThread.Post(() => CompositionBatchFinished(compositor, commit), DispatcherPriority.Send));
        return commit;
    }

This happens after upgrade from 11.0.0-preview6 to 11.0.0-rc1.1

To Reproduce

Clone https://github.com/arnirichard/visual_neural_networks
Debug project VisualNeuralNetwork and wait until data is loaded
Set “Image processing” to “Stretch” on one side (this may not matter at all)
Press “Next batches”
Exception occurs after some time while the neural network is training (this did not happen in Avalonia 11.0.0-preview6

Expected behavior No exception should occur

Screenshots