LAS + cover is failing on C# predict call

[ataymano]

Describe the bug

There is nondeterministic AccessViolation exception during C# Predict call with LAS and cover exploration turned on (I was not able to reproduce it after removing any of LAS/cover/C# property, but do not have intuition why it matters).

How to reproduce

static void CbTest()
{
    string b64_model = null;
    using (
        var vw =
        new VW.VowpalWabbit($"--cb_explore_adf --large_action_space --max_actions 2 --cover 5 --full_predictions"))
    {
        var test = new List<string>();
        test.Add("shared | s_1");
        for (int i = 0; i < 200; ++i)
        {
            test.Add("| a_" + i.ToString());
        }
        using (var coll = new VW.VowpalWabbitMultiLineExampleCollection(vw, null, test.Select(x => vw.ParseLine(x)).ToArray()))
        {
            var prediction = coll.Predict(VW.VowpalWabbitPredictionType.ActionProbabilities);
            double sum = prediction.Select(x => x.Score).Sum();
            Console.WriteLine(sum);
        }
    }
}

From time to time (but quite often), I am able to get this:

Version

9.5

OS

Windows

Language

C#

Additional context

No response