Get-Help ...\ScriptWithCommentBasedHelp.ps1 -ShowWindow
# no error, help is displayed in separate window

Get-Help ...\ScriptWithCommentBasedHelp.ps1 -ShowWindow
An error has occurred that was not properly handled. Additional information is shown below. The PowerShell process will exit.
Unhandled exception. System.ArgumentOutOfRangeException: 1 ('1') must be greater than or equal to '8'. (Parameter '1')
Actual value was 1.
   at System.ArgumentOutOfRangeException.ThrowLess[T](String paramName, T value, T other)
   at System.ArgumentOutOfRangeException.ThrowIfLessThan[T](T value, T other, String paramName)
   at Microsoft.Management.UI.Internal.ParagraphBuilder.TextSpan..ctor(Int32 start, Int32 length)
   at Microsoft.Management.UI.Internal.ParagraphBuilder.AddText(String str, Boolean bold)
   at Microsoft.Management.UI.Internal.HelpParagraphBuilder.AddStringSection(Boolean setting, String sectionName, String sectionTitle)
   at Microsoft.Management.UI.Internal.HelpParagraphBuilder.AddTextToParagraphBuilder()
   at Microsoft.Management.UI.Internal.HelpViewModel..ctor(PSObject psObj, Paragraph documentParagraph)
   at Microsoft.Management.UI.HelpWindow..ctor(PSObject helpObject)
   at Microsoft.PowerShell.Commands.Internal.HelpWindowHelper.<>c__DisplayClass0_0.<ShowHelpWindow>b__1()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)

[process exited with code 3762504530 (0xe0434352)]
You can now close this terminal with Ctrl+D, or press Enter to restart.