Unreal Engine Issues

Actor Channel failure occurs when quickly unloading and loading a streaming level

With high enough latency, quickly unloading an reloading a streaming level with a replicated actor on the server can cause the actor channel on the client to fail to find this actor: UActorChannel:: ...

Assertion failed in FNetGUIDCache::CleanReferences during seamless travel after reloading primary asset package

Following this sequence of events, the ObjectLookup and NetGUIDLookup on the server's PackageMapClient will end up in a bad state. In the ObjectLookup Map, the primary asset's package will be mapped ...

AssetRegistry: In a packaged game ScanPathsSynchronous with bForceRescan=true will permanently forget about assets inside IOStore containers

This came up from several discussions on UDN and internal discussion. The root cause is that the AssetRegistry currently cannot discover packages inside IOStore containers, it relies on the seriali ...

ChaosWheeledVehicleMovementComponent is breaking the const CDO contract and changes to the instances are being applied to the CDO

As described by the licensee, the const CDO contract is being broken on ChaosWheeledVehicleMovementComponent. The issue the licensee is facing is that by spawning cars with different configurations, ...

Fatal error when creating listen server on an instance with a PendingNetGame

This seems to occur because the PendingNetGame is not destroyed when the instance browses to the new level to start listening. In UEngine::LoadMap, UWorld::SetGameMode will create the game mode, pro ...

Fields with Maximum resolution are not affecting all leaves of a Geometry Collection

Fields with Maximum resolution are not affecting all leaves of a Geometry Collection on 5.4 and onwards. When calling GetRelevantParticleHandles() a Maximum Resolution field does return all particl ...

Chaos Trailing Events not exposed to Blueprints and only accessible via Niagara Chaos DI

Chaos Trailing Events not exposed to Blueprints and only accessible via Niagara Chaos DI. The licensee noticed that the Trailing event is not available to BPs. It's expected that the same data avail ...

Compile error when including OnlinePurchaseInterfaceSteam.h

Map placed actor binding to another actor's Event Dispatcher (multicast delegate) results in duplicate bindings after blueprint recompile

Context Blueprint actors placed on the map can bind to another actor's event. If an ActorB has a reference to ActorA, it can bind to an event dispatcher in A by creating an event node in ActorB's e ...

Modifiers do not behave as expected when adding conflicting mappings of different priorities