Unreal Engine Issues

AnimNotify serialization crash in editor

The crash is caused by changing the variable type of an AnimNotify that is already referenced by a montage. This issue cannot be reproduced in 5.6. ...

UAbilityTask_SpawnActor::BeginSpawningActor may return true when SpawnedActor contains stale value

UAbilityTask_SpawnActor::BeginSpawningActor assumes the incoming AActor*& SpawnedActor parameter is nullptr if no actor was spawned, but it does not initialize the parameter at the start of the func ...

GroomComponent: SetVisibility(false) causes per-frame simulation reset instead of stopping it

UGroomComponent::TickComponent sets bResetSimulation = true every frame when the component is not visible. This causes NiagaraDataInterfaceHairStrands to triggering a full simulation reset every fra ...

Nanite Skeletal Mesh ignores Hidden Material Section flag

Unlike non-Nanite Skeletal Meshes, Nanite-enabled Skeletal Meshes do not correctly respond to the Show flag passed via ShowMaterialSection(). Consequently, the Isolate checkbox for material slots in ...

Frame-locked sequencer intermittently triggers notify state end event

Frame-locked Sequencers can occasionally produce frames with a zero delta time due to frame number truncation. When this occurs, if the animation cursor is within the range of a Notify State that is ...

Sequencer CR curve evaluating differently when navigating from parent sequence

Depending on whether I first open the level sequence that contains the control rig, or its parent level sequence, the animation curve will evaluate differently.  ...

LevelStreamingPersistence: Crash when streaming in destroyed map actor with persisted properties

Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors and components that are part of a streamed level. Saved property values are restored when a lev ...

LevelStreamingPersistence: BP variables that aren't Instance Editable get reset

Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors and components that are part of a streamed level. Blueprint variables can be marked as instan ...

Adding a level instance to the persistent level puts its navmesh in the wrong place

Videos not displaying on projector light

Reported in SF [Link Removed] When inserting a video into the projector light, the projector light no longer appears to work. The reporting user is on a Mac machine (M4). I was not able to reprodu ...