Unreal Engine Issues
Unreal Engine Issues
Custom Primitive Data on BP instance not taking affect while in editor
UE - Rendering Architecture - Apr 5, 2023https://udn.unrealengine.com/s/case/5004z00001n9LsOAAU/custom-primitive-data-on-bp-inst ance-not-taking-affect-while-in-editor Original Repo is from 4.27, however, it still happens in 5.2. This is ...
Undo/Redo can cause the gizmo to desync from a leaf-selected component
UE - Editor - Workflow Systems - Oct 18, 2021This is a regression from 4.27. This is happening because of the change to typed elements. UEditorEngine::PostUndo, when combined with the typed element changes causes the selection set to reorder ...
[CrashReport] Linux crash - FLinuxSplashState::InitSplashResources()
UE - Platform - Linux - Oct 27, 2017This is a trending Linux crash in 4.18. It seems to occur before a project loads. Callstack from Log[2017.10.27-08.31.13:659][ 0]LogInit: - Physical RAM available (not considering process quota) ...
Collision profiles are reset when blueprint is loaded
UE - Gameplay - Jan 6, 2025In UE 5.5 (and earlier versions), FCollisionResponse::operator== has incorrect behavior where it will detect that two collision response containers are identical if they have the same number of entr ...
Material expression If node has been broken, major regression that shipped in 4.6
UE - Graphics Features - Dec 9, 2014This sounds legit. Anyone mess with the if node recently? There seems to be a regression where existing content is broken. This should be fixed ASAP and patched into 4.6. https://forums.unrealen ...
Noticeable input delay at lower FPS while Playing in Editor
UE - Editor - UI Systems - Mar 1, 2022When playing in editor is running at a lower fps (<20) there is very noticeable input delay that wasn't present in 4.27.2. Works correctly while playing in Stand Alone or Packaged. Tracked this iss ...
[AI] EQS incorrectly sorts when auto-sort in single-item mode when there is only one filtering and one scoring test.
UE - AI - EQS - Dec 14, 2021EQS places a cheap filter as the last step of a query when using auto-sort for single item results if there is only one filter. Found via [Link Removed] which is quoted below:Environmental Query sys ...
Assertion failed: (Index >= 0) & (Index < ArrayNum) when importing large Alembic file
UE - Editor - Content Pipeline - Datasmith - Importer - May 3, 2022Regression testing done on //UE4/Release-4.27.2 CL-18427296 and this issue did occur. [Link Removed] [Link Removed] Below is snips of customers description and proposed workaround:Importing alembi ...
[Device Swap][Crash][Stadia] - Crash changing audio device from 5.1 to stereo
UE - Audio - Mar 10, 2021There's a crash on stadia when changing the audio device from 5.1 to stereo. There's also a related issue where voice chat breaks when changing from 5.1 to stereo. The background is that CL14889950 ...
Map placed actor binding to another actor's Event Dispatcher (multicast delegate) results in duplicate bindings after blueprint recompile
UE - Framework - Blueprint - Apr 17, 2025Context Blueprint actors placed on the map can bind to another actor's event. If an ActorB has a reference to ActorA, it can bind to an event dispatcher in A by creating an event node in ActorB's e ...