我按照https://github.com/nunit/nunit-vs-adapter/issues/125中的建议将解决方案中的所有Nuget包升级到最新版本，从而修复了该问题。我不知道为什么这就解决了它，但它确实解决了。

升级Nuget包后，我收到错误：

System.IO.FileLoadException : Could not load file or assembly 'nunit.framework, Version=3.13.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

通过以下https://github.com/SpecFlowOSS/SpecFlow/issues/2387处的建议修复了此问题：