Unreal Engine Issues

Chaos Cache : When Min Speed To Spawn Trailing Particles > 0, particles are never spawned by chaos cache trailing events

Because UniagaradataInterfaceChaosDestruction::HandleTrailingEvents does not respect incoming TrailingEvent data, the debris velocity during chaos cache playback is always evaluated as zero. The fo ...

UI Flickers in Packaged Movie Render Queue builds

Visual Logger bForceUniqueNames does not result in unique names (regression)

Just a regression introduced with the VisLogger changes. ...

Interchange Dialog view resets when changing values

This happens with just about any option in any tab. QA confirmed it also happens in the Material tab. Regression: Yes - does not occur in //UE5/Release-5.4 @ CL34507850 - Binary Repro Rate: 10/10 ...

Light Complexity view mode crashes if there are hair cards in the scene

The Editor will crash if Groom Hair Cards are viewed with the Light Complexity View Mode. ...

Nanite mesh polygons disappearing when using masked opacity with vertex color in 5.4

In 5.4.3, a nanite enabled mesh with a material that takes its vertex color (R) and uses it as the opacity mask output in a masked blend mode material, causes the mesh to have disappearing polygons ...

check(!bPostTickComponentUpdate) fails triggered by UNiagaraComponent::CreateRenderState_Concurrent() and StaticMeshCompilingManager::FinishCompilation()

Reported alongside [Link Removed] Context: Some ActorComponents can schedule end-of-frame work which UWorld executes later in the frame in UWorld::SendAllEndOfFrameUpdates(). By-design it appears t ...

check(!bPostTickComponentUpdate) fails triggered by ~FStaticMeshComponentBulkReregisterContext() and FD3D12DynamicRHI::ProcessInterruptQueueUntil()

Context: Some ActorComponents can schedule end-of-frame work which UWorld executes later in the frame in UWorld::SendAllEndOfFrameUpdates(). By-design it appears that it's not allowed to schedule mo ...

Light Leaking With Raytraced Shadows On Lights With Non-Zero Source Length

Light sources which have the source length attribute set to a value greater than zero seem to be leaking light through occluding geometry (see the image below and repro project). Moving it away from ...

Chaos Cache : Event tracks are not saved second or subsequent geometry collection recordings

After the second recording time, the event listener registration in FGeometryCollectionCacheAdapter::InitializeForRecord is skipped. Here is a workaround :// We only need to register event handlers ...