PoshTools crashes devenv.exe on exit

Steps to reproduce:

Open Visual Studio 2017
Create/edit a PoshTools project
Save and close the project
Exit Visual Studio

Observed behavior:

Visual Studio (devenv.exe) turns invisible and hangs for a while (One might think that it exited normally), then crashes. Next time you start Visual Studio, it will display warning saying that PowerShell Tools has crashed previously and will suggest disabling it.

This is the entry from Windows Event Log:

Application: devenv.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Runtime.InteropServices.COMException
   at Microsoft.Internal.VisualStudio.Shell.Interop.IVsPackageManagerPrivate.LoadPackageWithContext(Guid& packageGuid, Int32 reason, Guid& context)
   at Microsoft.VisualStudio.Services.AsyncQueryService.AsyncServiceProvider.<LoadServicePackage>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Services.AsyncQueryService.AsyncServiceProvider.<GetServiceByGuidThrowing>d__15.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Services.AsyncQueryService.AsyncServiceProvider.<>c__DisplayClass10_0.<<Microsoft-VisualStudio-OLE-Interop-IServiceProvider-QueryService>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Threading.JoinableTask.CompleteOnCurrentThread()
   at Microsoft.VisualStudio.Services.AsyncQueryService.AsyncServiceProvider.Microsoft.VisualStudio.OLE.Interop.IServiceProvider.QueryService(Guid& guidService, Guid& riid, IntPtr& ppvObject)
   at EnvDTE80.ToolWindows.get_TaskList()
   at PowerShellTools.Classification.PowerShellTokenizationService.LoadTaskListTokens()
   at PowerShellTools.Classification.PowerShellTokenizationService+<>c.<StartTaskListThread>b__17_0()
   at System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
   at System.Threading.ThreadHelper.ThreadStart()

Visual Studio 2017 version 15.9.15

Windows version 10.0.17763.0

$PSVersionTable:

Name                           Value
----                           -----
PSVersion                      5.1.17763.592
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.17763.592
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

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