ScriptAnalyzerQuickFixer fails due to item already being in the hashtable

An exception is thrown in Visual Studio from the ScriptAnalyzerQuickFixer while trying to add an item which has already been added to the HashTable.

I am able to consistently replicate this by reopening the solution and clicking "show changes" from the AnkhSVN extension. This appears to be if there is any change to the file.

I am running:

Visual Studio Professional 2017 (15.8.9)

Powershell Tools for visual studio 2017 (4.0.19)

AnkhSVN (2.7.12815)

The entry in the Activity Log is:

<entry>
   <record>965</record>
   <time>2018/11/12 10:42:04.513</time>
   <type>Error</type>
   <source>Editor or Editor Extension</source>
   <description>System.ArgumentException: Item has already been added. Key in dictionary: &apos;ScriptAnalyzerQuickFixer&apos;  Key being added: &apos;ScriptAnalyzerQuickFixer&apos;&#x000D;&#x000A;   at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)&#x000D;&#x000A;   at System.Collections.Hashtable.Add(Object key, Object value)&#x000D;&#x000A;   at System.Collections.Specialized.HybridDictionary.Add(Object key, Object value)&#x000D;&#x000A;   at Microsoft.VisualStudio.Utilities.PropertyCollection.AddProperty(Object key, Object property)&#x000D;&#x000A;   at PowerShellTools.QuickFix.ScriptAnalysisSuggestedActionsSourceProvider.CreateSuggestedActionsSource(ITextView textView, ITextBuffer textBuffer)&#x000D;&#x000A;   at Microsoft.VisualStudio.Language.Intellisense.Implementation.LightBulbBroker.&lt;&gt;c__DisplayClass50_0.&lt;CreateSourcesForBuffer&gt;b__0(ISuggestedActionsSourceProvider provider)&#x000D;&#x000A;   at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InvokeMatchingFactories[TExtensionInstance,TExtensionFactory,TMetadataView](IEnumerable`1 lazyFactories, Func`2 getter, IContentType dataContentType, Object errorSource)&#x000D;&#x000A;--- End of stack trace from previous location where exception was thrown ---&#x000D;&#x000A;   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)</description>
 </entry>

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