Unreal Engine Issues

Crash when moving map assets used as level instances

Crash when dragging and dropping sub-level Actors into HLOD Outliner

In 4.27.2 a new cluster is created without any problem. ...

GAS: Crash on resizing FActiveGameplayEffectsContainer::AttributeValueChangeDelegates while executing a contained delegate

Game code can register listeners to when a GAS attribute changes value, for example by calling: AbilitySystemComponent->GetGameplayAttributeValueChangeDelegate(SomeAttribute).AddLambda(); These de ...

ResavePackages fixredirects commandlet crashes Assertion failed: FLinkerLoad::FindExistingLinkerForPackage(Package)

Replicated subobjects list crashes with unreachable yet valid objects when UE_NET_SUBOBJECTLIST_WEAKPTR=0

This seems to occur when the subobject is considered unreachable but is not yet pending kill/marked as garbage. In this case, IsValid returns true while FWeakObjectPtr::Get returns nullptr for the o ...

UE5.4 Regression - crash when disabling shader optimization while raytracing is enabled on D3D12

Certain interactions between a Rect Light with a Light Function and a Post-Process volume lead to a check() when compiling a Ray Tracing PSO for tracing lights. This check() only happens when shader ...

Converting a modular character to a static mesh can result in a crash or in an asset with corrupted data

Assigning a static mesh to a Mutable Clip Mesh With Mesh Node can crash the editor

Context: The Mutable plugin has a modifier node called Clip Mesh With Mesh that allows Static Mesh modifiers to be assigned as the clip mesh. Under certain circumstances, an assert can be triggered ...

Geometry Collection cluster handles leaking and causing ensures with field systems

Geometry Collection cluster handles leaking and causing ensures with field systems. The licensee has shared their analysis: We have been tracking down an assert that seems to happen occasionally wh ...

UClass::SparseClassDataStruct null at editor-time for child blueprints until compile

Child blueprints of a blueprint of a native actor class with sparse data can have an incorrectly null SparseClassDataStruct value, and thus fail to initialzie their SparseClassData. This affects edi ...