Flurl Test for sync and async on old version and new version

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we use .net framework 4.6.2 with flurl 2.4.2 and 4.0.2

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Flurl 2.4.2

Async

Async with ConfigureAwait(false)

Sync

Sync with ConfigureAwait(false)

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Flurl 4.0.2

Async

Async with ConfigureAwait(false)

Sync

Sync with ConfigureAwait(false)

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Result

On both new and old version if we use sync like bellow code we get time out.
Also WithTimeout not work on this code

return _baseHttpAddress
        .WithHeaders(headers)
        .WithTimeout(TimeSpan.FromSeconds(TimeOutOnSecond))
        .AppendPathSegment(url)
        .SetQueryParams(query)
        .GetJsonAsync<TResponse>()
        .GetAwaiter().GetResult();

If add ConfigureAwait(false) problem will be solved on low concurrency.
If we increase threads more than 100, we get errors again.

return _baseHttpAddress
        .WithHeaders(headers)
        .WithTimeout(TimeSpan.FromSeconds(TimeOutOnSecond))
        .AppendPathSegment(url)
        .SetQueryParams(query)
        .GetJsonAsync<TResponse>()
        .ConfigureAwait(false).GetAwaiter().GetResult();

This problem happened only on first call, for example if call sync and wait to complete and then again call sync, we don't get any errors