Run multiple Integration Tests that use Wiremock

In my Specflow project i have a .features file with multiple test scenarios. the thing those tests have in common is that they all use a single Wiremock Server.

Now when I run the tests they always fail except for one. This problem also occurs when i deactivate parallel running in Ncrunch or VS testrunner.

I have tried running a single test while ignoring all the others, the test always passes so I came up with the conclusion that something is wrong with my wiremock server. Is there a special configuration needed for Wiremock server when running multiple scenarios in one .features file?

This is part of the specflow Hook File that sets up the tests:

public static void RegisterServices(ScenarioContext scenarioContext)
{
    WireMockServer httpBackend = RegisterWireMock(scenarioContext);
    // ...
    scenarioContext.Set(httpBackend);
}
private static WireMockServer RegisterWireMock(ScenarioContext scenarioContext)
{
    var httpBackend = WireMockServer.Start(new WireMockServerSettings()
    {
        UseSSL = false
    });
    scenarioContext.ScenarioContainer.RegisterInstanceAs(httpBackend, dispose: true);
    return httpBackend;
}
[BeforeScenario]
public static void Setup(ScenarioContext scenarioContext)
{
    RegisterServices(scenarioContext);
    /// ...
    var httpBackend = scenarioContext.Get<WireMockServer>();
    // Setup expectations for wiremock server ...
}
[AfterScenario]
public static void DisposeAll(ScenarioContext context)
{
    /// ...
    context.Get<WireMockServer>().Dispose();
}

// In this method, which is called during all integration tests,
// the tests fail because of a timeout. The timeout occurs because of
// the manual reset event never being set what should happen if the log
// entries of our wiremock server change. (and this works if you run the
// tests manually, one-by-one).
private void WaitForMessage(Predicate<ILogEntry> selector = null)
{
    var httpBackend = context.Get<WireMockServer>();
    using CancellationTokenSource cts = new CancellationTokenSource(TimeSpan.FromSeconds(30));
    using ManualResetEventSlim waitHandle = new ManualResetEventSlim();
    httpBackend.LogEntriesChanged += (object sender, NotifyCollectionChangedEventArgs e) =>
    {
        if (selector == null)
        {
            waitHandle.Set(); // <----
            return;
    }
        /// ...
        foreach (ILogEntry item in e.NewItems)
        {
            if (selector(item))
            {
                waitHandle.Set(); // <----
                return;
            }
        }
    };
    waitHandle.Wait(cts.Token); // <---- TIMEOUT EXCEPTION LEADING TO FAILED TEST
    cts.Token.ThrowIfCancellationRequested();
}

Wiremock Server Settings:

11/9/2021 9:38:17 AM [Debug] : WireMock.Net server settings {
  "Port": null,
  "UseSSL": false,
  "StartAdminInterface": null,
  "ReadStaticMappings": null,
  "WatchStaticMappings": null,
  "WatchStaticMappingsInSubdirectories": null,
  "ProxyAndRecordSettings": null,
  "Urls": null,
  "StartTimeout": 10000,
  "AllowPartialMapping": null,
  "AdminUsername": null,
  "AdminPassword": null,
  "RequestLogExpirationDuration": null,
  "MaxRequestLogCount": null,
  "AllowCSharpCodeMatcher": null,
  "AllowBodyForAllHttpMethods": null,
  "AllowOnlyDefinedHttpStatusCodeInResponse": null,
  "DisableJsonBodyParsing": null,
  "DisableRequestBodyDecompressing": null,
  "HandleRequestsSynchronously": true,
  "ThrowExceptionWhenMatcherFails": null,
  "CertificateSettings": null,
  "CustomCertificateDefined": false,
  "WebhookSettings": null
}