Unreal Engine Issues

USkeletalMeshComponent::HandleExistingParallelClothSimulation() calling WaitUntilTaskCompletes can trigger arbitrary task that modifies currently iterated UWorld::ComponentsThatNeedPreEndOfFrameSync

Context ActorComponents can schedule an end-of-frame update for themselves by calling UWorld::MarkActorComponentForNeededEndOfFrameUpdate. The UWorld will iterate all those actor components once pe ...

Physics Asset primitives are being created with the default Name as None instead of BoneName_PrimitiveType

When creating Physics Assets, either by automatic creation upon import, creation from skeletal meshes already in the project, or when we press Generate All Bodies (bottom right of a opened Physics A ...

Crash when exposing a TOptional<FName> or TOptional<FText> to the editor through a UProperty.

Support for editor-exposed uproperties of type TOptional<T> has been added by CL 28199740 on september 2023. However, since then until today in UE 5.5, a crash can happen when exposing TOptional<FNa ...

Orientation Warping breaks incoming poses where bones are in component space

The orientation warping node breaks incoming poses where bones are already in component space. This is because, in EvaluateSkeletalControl_AnyThread, we are repeatedly setting bone transforms direc ...

Crash after generating HLODs for merged meshes that have all triangles culled

Crash after adding an AI Perception component to a parent and child character

Crash after adding an AI Perception component to a parent and child character. First they both must have had AI Perception components > Compiled and saved > Then both AI Perception components delete ...

[CrashReport] FPhysicsAssetEditorSharedData::FPhysicsAssetEditorSharedData

This is a trending crash coming out of the 4.18 release, and may be a regression. Users have not provided any descriptions of their actions when the crash occurred. Source Context 2290 #end ...

Loading a blueprint with an invalid gameplay tag container pin causes ensure and data loss

The gameplay tag system depends on tags being registered with the global manager as valid in order to correctly read them off disk. Two different issues are combining to cause a confusing ensure and ...

Custom Primitive Data on BP instance not taking affect while in editor

https://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 ...

HotReload fails with Linker errors when using Visual Studio 2017

I had a tester with VS 2015 run through the steps I failed with, and they were unable to repro. JamesF was able to repro the issue on VS 2017. JamesF pointed out that this does not occur is you cho ...