Windows Metal Shader Compiler creates invalid shaders for iOS

UE - Platform - Apple - Feb 23, 2024

When installed app is started on device, log will say there's missing or invalid metal shaders ...

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

UE - Gameplay - Components - Feb 23, 2024

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 ...

Auto Exposure Compensation Curve issue when switching from Manual to Histogram

UE - Rendering Architecture - Feb 21, 2024

When switching the Camera's Exposure Metering Mode from Manual toHistogram, the exposure level resets and takes time to settle. The Licensee has a proposed code change that would fix this issue. Als ...

Auto Exposure Compensation Curve issue when switching from Histogram to Manual

UE - Rendering Architecture - Feb 21, 2024

When switching the Camera's Exposure Metering Mode from Histogram to Manual, there is a single-frame flash. The Licensee has a proposed code change that would fix this issue. Also found in 5.4, CL 3 ...

Cumulative Patching does not work with Pak signing

UE - Foundation - Feb 20, 2024

Cumulative patching is implemented by copying the generated pak files during staging of the base and each patch to the Releases directory. When creating a patch, all of the pak files from the releas ...

Copied Actors in World Partition Levels Maintain References to Actors They Are Copied From

UE - World Creation - Worldbuilding Tools - World Partition - Feb 19, 2024

When an Actor is duplicated in the editor inside a world partition level it maintains references to the Actor it is a copy of. This can cascade, i.e. Actor C, which is a copy of Actor B which is a c ...

Blueprint "Diff Against Depot": Restoring an instanced object results in reference to the object in the temporary diff asset

UE - Gameplay - Blueprint - Feb 19, 2024

When diffing a blueprint against depot via the Content Browser context menu action "Revision Control > Diff Against Depot", restoring an instanced object property from the depot version results in t ...

MoviePlayer loading screen with FLoadingScreenAttributes::bAllowEngineTick results in high DeltaSeconds tick post-playback

UE - Gameplay - Feb 16, 2024

IGameMoviePlayer playback of a movie during loading screen lets you set bAllowEngineTick  = true as a parameter. This will make FDefaultGameMoviePlayer manually tick the engine: if (GEngine && bAll ...

UNetDriver server-side hitch results in ActorInfo->NextUpdateTime far into future

UE - Networking - Feb 16, 2024

A high UWorld::Tick DeltaSeconds (i.e. GameThread hitch) results in a high UNetDriver::TickFlush DeltaSeconds. This DeltaSeconds can high (many seconds) if the hitch is long. This value then affects ...

Cursor input does not work properly in exclusive fullscreen mode on a secondary monitor

UE - Editor - UI Systems - Slate - Feb 14, 2024

Input doesn't seem to work properly when using exclusive fullscreen mode on some monitor other than the primary monitor. This is similar to other issues we've seen in the past with the cursor being ...