Unreal Engine Issues
Unreal Engine Issues
References to Data Assets that inherit from Blueprints may be broken during reinstancing
UE - Gameplay - Blueprint - Nov 30, 2020It is possible to create new Data Asset instances in the editor that inherit from a blueprint-defined subclass of UDataAsset. This flow is not very well supported, and generally it is safer to just ...
AssetRegistry has poor performance when a large map is resaved: Directory IO
UE - Core - Data Pipeline - Cooker - Mar 10, 2025IO cost of directory scans is one of the costs present in the AssetRegistry when a large map is resaved. Maps can have external actors which all have to be rescanned and reported to the map for incl ...
Blueprint classes are listed in Object pickers, but will not work as expected
UE - Framework - Blueprint - Jul 28, 2020Because of the way blueprints are implemented, the "Blueprint Class" asset actually points to the editor-only UBlueprint object. Because of this, all blueprint classes will show up as options for ge ...
UDataLayerManager::Initialize perf issue in Editor build
UE - Engine Scaling - Streaming - Data Layers - Mar 24, 2025In editor, WorldDataLayers acceleration table used to map DL Names to DL instances is not created. The main reason was to avoid to handle all the case where it would need to be updated. When UDataL ...
Additive Animation does not work as intended when Ref Frame Index is more than zero
UE - Runtime - Animation - Dec 19, 2023In some conditions, additive animation shows different/wrong behavior on Standalone Game and packaged game, from the other PIE. Watch the attached video. [Link Removed] The key points to reproduce ...
[CrashReport] UE4Editor_BlueprintNativeCodeGen!FBlueprintNativeCodeGenModule::GenerateSingleAsset() [blueprintnativecodegenmodule.cpp:391]
UE - Gameplay - Blueprint Runtime - Aug 22, 2016This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below. Error message: Assertion failed: bSuccess [Link R ...
[CrashReport] UE4Game!FStreamingManagerTexture::FStreamingManagerTexture()
Tools - Jun 6, 2016This Jira was created from CrashReports submitted by the public due to the high number of occurrences. This crash is only occurring in packaged games, not in the editor. The Logs contain the follo ...
[CrashReport] UE4Editor_UnrealEd!TSet<FEditorUndoClient * | SActorDetails::~SActorDetails
Tools - Sep 20, 2017This is a somewhat common crash coming out of 4.16 and 4.17. Users have not provided any description of their actions when the crash occurred. The top line of the callstack and the source context ...
Package Map may clear out references to GUIDs on clients but not servers
UE - Networking - Jul 13, 2020Upon Seamless Travel, the Package Map will attempt to clear out "old" entries in the Guid Cache by marking them with a timeout. The only entries that will actually be marked for a timeout are entrie ...
AbilityTask_PlayMontage will 'zombie' if Interrupted during BlendOut
UE - Gameplay - Gameplay Ability System - Apr 14, 2023User reports: I've noticed a bug with PlayMontageAndWait There are 4 possible triggers when a Montage completes:OnCompletedOnBlendOutOnInterruptedOnCancelled Once OnBlendout has been triggere ...