Unreal Engine Issues

Crash on applying animation modifier for some assets

When removing curves on some assets, a crash can occur. This seems to be due to const FSmartNameMapping* CurveMapping being null and dereferenced within UAnimationBlueprintLibrary::RetrieveContainer ...

BeginPlay not called for Post-Process Anim Instance

Post-Process Anim Instances do not have BeginPlay called. The proposed fix is to addif (PostProcessAnimInstance) { PostProcessAnimInstance->NativeBeginPlay(); PostProcessAnimInstance->Blu ...

Internal Compiler Error: Tried to create a property Crash in scope Beta_C, but another object (ObjectProperty /Game/Alpha.Alpha_C:Crash) already exists there.

After fixing the crash from [Link Removed] when compiling the child blueprint that has claimed the component name the parent was previously using without having compiled the parent, an internal comp ...

Hide Bone in constructor does not update world instances

Hiding bones during construction is not properly displayed by level instances placed at editor time. Note that setting 'Update animation in editor' on the mesh and re-running the constructor script ...

Animation flickers when made visibility is re-enabled

An animation can display an incorrect frame upon having its visibility re-enabled, resulting in a noticeable flicker. This can be prevented by setting the mesh's 'Visibility Based Anim Tick Option' ...

Crash when Pasting a Gameplay Tag variable setter into a level Blueprint

Copying a gameplay tag variable setter from a blueprint into a level blueprint fails an assert in UGameplayTagsManager::GetCategoriesMetaFromField. ...

World Compositor out of touch with loaded levels state

Crash when using world composition origin rebasing

Assertion failed: Pair != nullptr [Link Removed] [Line: 566] UE4Editor_Core!AssertFailedImplV() [e:\unrealeditorplaydead\engine\source\runtime\core\private\misc\assertionmacros.cpp:105] UE4Editor_C ...

PhysX Clang Builds Broken

Clang physx builds in 4.23 seem to be broken due to a change of GuPersistentContactManifold.h including #pragma warning and no longer ending in a new line. ...

Calling GEngine->Browse from an RPC implementation causes a crash

The engine is not resilient to calling Browse from within an RPC implementation, and likely not resilient to other ways of destroying the net driver within RPCs/OnReps. It's not something we need to ...