Blueprint interface function with the same name as a node gets fused

Creating a Blueprint interface and changing its function name causes a crash when using the undo button to change the name back.

User created video included that shows steps to reproduce.

Follow these steps to reproduce with the provided sample project.

1. Press play and then press X to see the Error/Warnings report pop up
2. Open the Blueprint Interface and rename the function from TearOff to TearOffa and compile
3. Go back into the ThirdPersonCharacter Blueprint and press compile
4. Go up to the edit tab and select Undo a crash should follow

Full steps for clean project.

1. Create a new Third Person project
2. Create a new Blueprint Interface
3. Open the new Blueprint and name the Function "TearOff"
4. Once renamed click compile and open the ThirdPersonCharacter Blueprint
5. Click Class Settings and click add under interfaces
6. From that drop down select NewInterface and then compile
7. Add a node for Keyboard "X"
8. Off of the Pressed node add the new interface Tear Off (Interface Call)
9. Add the Get a reference to self variable
10. Connect the self variable to the Tear Off replication node
11. Add the Event Tear Off and connect it to the Tear off function
12. Compile and then press play
13. Press X to see the Error/Warnings report pop up
14. Open the Blueprint Interface and rename the function from TearOff to TearOffa and compile
15. Go back into the ThirdPersonCharacter Blueprint and press compile
16. Go up to the edit tab and select Undo a crash should follow

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Assertion failed: ExistingPin && *ExistingPin [Link Removed] [Line: 1787]

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:414]
UE4Editor_Engine!UEdGraphPin::SerializePin() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1789]
UE4Editor_Engine!UEdGraphPin::SerializePinArray() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1671]
UE4Editor_Engine!UEdGraphPin::Serialize() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1502]
UE4Editor_Engine!UEdGraphPin::SerializePin() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1831]
UE4Editor_Engine!UEdGraphPin::SerializePinArray() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1671]
UE4Editor_Engine!UEdGraphNode::Serialize() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\edgraph\edgraphnode.cpp:443]
UE4Editor_BlueprintGraph!UK2Node::Serialize() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\blueprintgraph\private\k2node.cpp:115]
UE4Editor_BlueprintGraph!UK2Node_CallFunction::Serialize() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\blueprintgraph\private\k2node_callfunction.cpp:1873]
UE4Editor_UnrealEd!FTransaction::FObjectRecord::SerializeContents() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\editortransaction.cpp:150]
UE4Editor_UnrealEd!FTransaction::FObjectRecord::Load() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\editortransaction.cpp:194]
UE4Editor_UnrealEd!FTransaction::Apply() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\editortransaction.cpp:460]
UE4Editor_UnrealEd!UTransBuffer::Undo() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\editortransaction.cpp:891]
UE4Editor_UnrealEd!UEditorEngine::Exec_Transaction() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:5046]
UE4Editor_UnrealEd!UEditorEngine::Exec() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:5493]
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\unrealedsrv.cpp:672]
UE4Editor_MainFrame!FMainFrameActionCallbacks::ExecuteExecCommand() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\mainframe\private\frame\mainframeactions.cpp:1014]
UE4Editor_MainFrame!TBaseStaticDelegateInstance<void __cdecl(void),FString>::ExecuteIfSafe() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:1027]
UE4Editor_Slate!FUICommandList::ExecuteAction() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1028]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:988]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64>::operator()<>() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:165]
UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64> >() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\templates\tuple.h:497]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:282]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:385]
UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator()() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5263]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:234]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5252]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5750]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5730]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1725]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2171]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:888]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:725]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:129]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3220]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll