Description

This is not a regression. Tested in //UE4/Release-4.27 CL18319896

Crash when recombining Value Pin after swapping Target Wild Card pin from a Vector2D to a Vector on a Set By-Ref Var node. 

Steps to Reproduce
  1. Create or open any project
  2. Create a new Blueprint Actor
  3. Create a Vector variable
  4. Create a Vector2D variable
  5. In the Event Graph create a 'Set By-Ref Var' node
  6. Get a reference to the Vector2D variable then connect it to the 'Target' pin
  7. Right click the 'Value' input pin then select 'Split Struct Pin'
  8. Disconnect the Vector2D from the 'Set By-Ref Var' node
  9. Get a reference to the Vector variable then connect it to the 'Target' pin
  10. Right click the 'Value' input pin then select 'Recombine Struct Pin'

Expected Results:
The pin recombines, but is now a Vector.

Actual Results:
The editor crashes:

Array index out of bounds: 2 from an array of size 2
Callstack
Error: === Critical error: ===
Error: 
Error: Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 691] 
Error: Array index out of bounds: 2 from an array of size 2
Error: 
Error: 
Error: [Callstack] 0x00007ff9298f454f UnrealEditor-BlueprintGraph.dll!UEdGraphSchema_K2::RecombinePin() [D:\build\++UE5\Sync\Engine\Source\Editor\BlueprintGraph\Private\EdGraphSchema_K2.cpp:7245]
Error: [Callstack] 0x00007ff92cc12fe0 UnrealEditor-Kismet.dll!FBlueprintEditor::OnRecombineStructPin() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\BlueprintEditor.cpp:4641]
Error: [Callstack] 0x00007ff92cbf120c UnrealEditor-Kismet.dll!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,1,void __cdecl(void),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:307]
Error: [Callstack] 0x00007ff93893b158 UnrealEditor-Slate.dll!FUICommandList::ExecuteAction() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:99]
Error: [Callstack] 0x00007ff938a1d551 UnrealEditor-Slate.dll!SMenuEntryBlock::OnClicked() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1148]
Error: [Callstack] 0x00007ff938a1e520 UnrealEditor-Slate.dll!SMenuEntryBlock::OnMenuItemButtonClicked() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1108]
Error: [Callstack] 0x00007ff938a00944 UnrealEditor-Slate.dll!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,1,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
Error: [Callstack] 0x00007ff938a9ba3b UnrealEditor-Slate.dll!SButton::ExecuteOnClick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:464]
Error: [Callstack] 0x00007ff938ac2df6 UnrealEditor-Slate.dll!SButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:389]
Error: [Callstack] 0x00007ff938a1e60c UnrealEditor-Slate.dll!SMenuEntryButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:434]
Error: [Callstack] 0x00007ff938864034 UnrealEditor-Slate.dll!<lambda_51e270ca99ea7ce852539efd04dd453f>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4959]
Error: [Callstack] 0x00007ff938846fc6 UnrealEditor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_51e270ca99ea7ce852539efd04dd453f> >() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:405]
Error: [Callstack] 0x00007ff9388c02ee UnrealEditor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4945]
Error: [Callstack] 0x00007ff9388a91b1 UnrealEditor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5493]
Error: [Callstack] 0x00007ff93889d5dc UnrealEditor-Slate.dll!FSlateApplication::OnMouseUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5458]
Error: [Callstack] 0x00007ff99101a92e UnrealEditor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2210]
Error: [Callstack] 0x00007ff991009247 UnrealEditor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2699]
Error: [Callstack] 0x00007ff99101ce51 UnrealEditor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1078]
Error: [Callstack] 0x00007ff9910049a7 UnrealEditor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:916]
Error: [Callstack] 0x00007ff9cccb5c0d USER32.dll!UnknownFunction []
Error: [Callstack] 0x00007ff9cccb5602 USER32.dll!UnknownFunction []
Error: [Callstack] 0x00007ff99101e148 UnrealEditor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:138]
Error: [Callstack] 0x00007ff7216e7114 UnrealEditor.exe!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5139]
Error: [Callstack] 0x00007ff721700d9c UnrealEditor.exe!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:183]
Error: [Callstack] 0x00007ff721700e8a UnrealEditor.exe!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147]
Error: [Callstack] 0x00007ff721703c4d UnrealEditor.exe!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283]
Error: [Callstack] 0x00007ff721715564 UnrealEditor.exe!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330]
Error: [Callstack] 0x00007ff721718736 UnrealEditor.exe!__scrt_common_main_seh() [d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
Error: [Callstack] 0x00007ff9ccb47c24 KERNEL32.DLL!UnknownFunction []
Error: [Callstack] 0x00007ff9ce54d721 ntdll.dll!UnknownFunction []

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Fixed
ComponentUE - Gameplay - Blueprint
Affects Versions5.0.3
Target Fix5.1
Fix Commit21209234
Main Commit21209234
CreatedJul 18, 2022
ResolvedJul 21, 2022
UpdatedAug 13, 2022