Debugger blows up in JsonElement.DebuggerDisplay.get

Question

I'm writing my first project trying to use System.Text.Json in a .net core app. I'm getting a jsonl file with a particular structure, and my requirements are in effect to UNPIVOT/flatten an array of child objects in one object into a stream of transformed objects.

It was going fine until I put a breakpoint on the routine doing the UNPIVOT and the debugger itself started blowing up with an access violation in JsonElement.DebuggerDisplay.get. Interestingly, a) it floats around which row it blows up on and b) it seems to be somewhat dependent on how long I wait before clicking Continue. In other words, if I wait a couple of seconds, it seems to work; if I click right away it blows up faster.

Just wondering if anyone else had run into something like this. And whether I should just switch back to NewtonSoft to avoid the headache.

Here's what my code looks like:

public static IEnumerable<MyResult> ConvertJson(JsonElement input)
{
    JsonElement transformArray, base_url;
    if (!input.TryGetProperty("child_objects", out transformArray) || transformArray.ValueKind != JsonValueKind.Array)
        yield break;
    if (!input.TryGetProperty("base_url", out base_url) || base_url.ValueKind != JsonValueKind.String)
        yield break;

    int i = 0;
    foreach(var o in transformArray.EnumerateArray())
    {
        // Break point on line below.  Click Continue too quickly, and I get DebuggerDisplay.get access violation
        var result = new MyResult();
        result.BaseURL = base_url.ToString();
        result.PageID = i; i++;
        JsonElement prop;
        if (o.TryGetProperty("prop1", out prop) && prop.ValueKind == JsonValueKind.String) result.Prop1 = prop.ToString();
        if (o.TryGetProperty("text", out prop) && prop.ValueKind == JsonValueKind.String) result.Text = prop.ToString();
        if (o.TryGetProperty("language", out prop) && prop.ValueKind == JsonValueKind.String) result.Language = prop.ToString();

        yield return result;
    }
}

and it's called like this:

string l = JsonlStream.ReadLine();
var json = JsonSerializer.Deserialize<JsonElement>(l);
foreach (var i in ConvertJson(json))
{
    ...
}