Crash in NaniteStreamManager when Nanite data fails to decode corrupt data from DDC

UE - Graphics Features - Nanite - Sep 11, 2024

If Nanite data becomes corrupt in the DDC, the Editor may crash in FStreamingManager::InstallReadyPages() when the Pending.State is FPendingPage::EState::DDC_Ready but the resulting SrcPtr is null b ...

VisionOS deferred renderer regression

UE - Platform - XR - Sep 11, 2024

Deferred desktop renderer does not function correctly on visionOS.  It did work in 5.4.  One problem is the r.XRMSAAMode setting forcing 4 samples even when not using msaa, but there are other probl ...

Assert in MoviewPipelinePIEExecutor when cancelling movie scenes during rendering

UE - Anim - Sequencer - MRQ - Sep 11, 2024

When rendering a single Level Sequence with MRQ, removing the Level Sequence that is actively rendering will create an array out of bounds exception. Also confirmed in //UE5/Main, CL: 36086643 ...

OnlineServices-Lobbies: Crash when host migration message is received and the next host has already left the session

UE - Online - Sep 9, 2024

A crash occurs at FindChecked in the code below.if (PreparedServiceChanges->OwnerAccountId) { InternalPublicData->OwnerAccountId = *PreparedServiceChanges->OwnerAccountId; if (bDispatchNot ...

Unreal Editor 5.4.4 crash when reproducing a LevelSequence in loop while PIE.

UE - Anim - Sequencer - Sep 9, 2024

A crash inside Unreal Engine Editor version 5.4.4 occurs when reproducing a Level Sequence while in PIE. This issue is a regression. It only crashes in version 5.4.4. It was working correctly in ver ...

Anim Composite root motion preview is broken

UE - Anim - Gameplay - Sep 6, 2024

LoopAndReset preview option is broken after one loop for anim composites ...

Enabling ZenLoader causes editor crash when undoing Level Instance deletion

UE - CoreTech - Sep 5, 2024

Crash reported through UDN. With ZenLoader enabled, deleting a level instance and triggering Undo causes a crash in  ULandscapeComponent::PostEditUndo() The user has provided an example project th ...

EditorOnlyReferences on actor descriptions are not properly computed/can include non editor only references

UE - World Creation - Worldbuilding Tools - World Partition - Sep 3, 2024

From licensee:"[...] the issue is that ActorsReferencesUtils::GetActorReferences (/FArchiveGatherExternalActorRefs) will only analyze a reference to an object (/actor) once, if it's editor only the ...

Volume material doesn't support EyeAdaptation node

UE - Niagara - Rendering - Sep 2, 2024

Actor blueprint 'bOptimizeBPComponentData' breaks subobject instantiation for runtime spawned actors in cooked builds

UE - Framework - Blueprint Runtime - Aug 29, 2024

A user has reported that when an actor blueprint enables Generate Optimized Component Blueprint Data, default instanced objects of components are not properly duplicated in cooked builds. This resul ...