There is an issue where renaming assets keep the old files, which can easily occur after renaming files after a lunched project. This issue keeps old versions of files, these files keep in the content folder, retaining their old names as well. This issue does not appear to be a regression.
Versions Tested: Issue occurs in all versions tested
4.17.2 CL - 3658906
4.18.3 CL - 3832480
4.19p3 CL - 3861363
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: begin: stack for UAT UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: === Handled ensure: === UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: Ensure condition failed: ShouldSerializeWidgetTree(TargetPlatform) == false [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\UMG\Private\UserWidget.cpp] [Line: 1721] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: Stack: UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D57F2786 UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:200] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D559123A UE4Editor-Core.dll!FDebug::EnsureFailed() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:298] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D55AB906 UE4Editor-Core.dll!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:425] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000CDA2C2C2 UE4Editor-UMG.dll!UUserWidget::PreSave() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\umg\private\userwidget.cpp:1721] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D50D1077 UE4Editor-CoreUObject.dll!FPackageExportTagger::TagPackageExports() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:2828] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000D50BA5F6 UE4Editor-CoreUObject.dll!UPackage::Save() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3523] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000CEA8EB8D UE4Editor-UnrealEd.dll!UEditorEngine::Save() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:4220] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000CE95112E UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:3229] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000CE952473 UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackages() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2300] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000CE95E3B7 UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:1763] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000CE7F7D61 UE4Editor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:902] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000CE81F391 UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4+release-4.18+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:583] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000003F5DD25F UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2167] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000003F5D525A UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launch.cpp:127] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000003F5D54AA UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000003F5E2379 UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000003F5E3193 UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00000000774359CD kernel32.dll!UnknownFunction [] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: [Callstack] 0x000000007756A561 ntdll.dll!UnknownFunction [] UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogOutputDevice: Error: end: stack for UAT
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-54776 in the post.