Background Service - Error 1067: The process terminated unexpectedly

I have developed a background service which is deployed to IIS. In my ExecuteAsync, I have added a top-level try-catch in which I perform Environment.Exit based on whether the cancellation was requested or not.

However, when I go and stop the service in services.msc, I get a popup telling me the service shut down unexpectedly.

This is how my ExecuteAsync looks like:

protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
    try
    {
        // Do stuff
    }
    catch (Exception ex) when (stoppingToken.IsCancellationRequested)
    {
        _logger.LogError(ex, ex.Message);
        Environment.Exit(0);
    }
    catch (Exception ex) when (!stoppingToken.IsCancellationRequested)
    {
        _logger.LogCritical(ex, ex.Message);
        Environment.Exit(-1);
    }
}

Is there a reason why I am receiving this popup when I shut down the service since the IsCancellationRequested should be set to true.