Unreal Engine Issues

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 ...

Physics Constraint Actor: When plasticity is enabled, Drive Position Target is reset to zero on constraint initialization

When a Chaos joint constraint is first created, having linear/angular plasticity enabled will unexpectedly force its linear/angular drive position target to zero on initialization, disregarding the ...

World Condition FWorldConditionQuerySharedDefinition fails to Link in builds in Unreal Engine 5.7

In FWorldConditionQuerySharedDefinition::PostSerialize, if (Ar.IsLoading() && SerializedObject != nullptr) the SerializedObject is currently only used for debug logging within Link() and is not ...