Unreal Engine Issues
Unreal Engine Issues
WorldSettings of each World Partition cell are replicated in cooked builds
UE - Framework - Networking - Oct 19, 2026In a cooked package build, when the cell package is loaded, AActor::PostInitProperties (Actor.cpp:555) sets RemoteRole = bReplicates ? ROLE_SimulatedProxy : ROLE_None from the CDO default (bReplicat ...
Iris - Crash when reading token data for unregistered token data store
UE - Framework - Networking - Oct 12, 2026FNetTokenStore::UnRegisterDataStore will set the TUniquePtr<FNetTokenDataStore> to null, but it doesn’t resize the TokenDataStores array. If FNetTokenStore::ReadTokenData is later called, it will ge ...
UNetConnection::NotifyConnectionUpdated always sets MyConnectionId to 1
UE - Framework - Networking - Jul 28, 2026This looks to be due to an oversight in how the conditions are checked in NotifyConnectionUpdated, where the “&&” operator results in MyConnectionId always being set to 0 or 1:if (const uint32 MyCon ...
Replication Graph - Reliable multicast RPC may be dropped for actor recently set to dormant
UE - Framework - Networking - May 8, 2026The replication graph will wait until the client acks the close bunch and the actor channel is cleaned up to remove the channel from the ActorInfoMap (see UNetReplicationGraphConnection::NotifyActor ...
Iris - Initially dormant actors not replicated if dormancy is not enabled
UE - Framework - Networking - Feb 16, 2026With dormancy disabled, it seems that actors marked as dormant are not registered as expected with Iris. Even if the actor is woken up or flushed before making changes to its properties, the client ...
Iris - HitObjectHandle not resolved when receiving FHitResult
UE - Framework - Networking - Feb 12, 2026This seems to occur due to an interaction between how Iris handles serializing the FGameplayAbilityTargetData_SingleTargetHit struct and how the FActorInstanceHandle HitObjectHandle in the FHitResul ...
Attached actors have AttachmentReplication marked as dirty every net update
UE - Framework - Networking - Feb 11, 2026In AActor::GatherCurrentMovement, bWasAttachmentModified will be set to true if the actor’s root component has an AttachParent, even if none of the values in the AttachmentReplication struct have ch ...
"Could not find static actor" errors on standalone editor client when connecting to PIE server
UE - Framework - Networking - Feb 4, 2026This seems to be due to how FObjectReferenceCache and UEngineReplicationBridge handle remapping object paths for PIE. When creating the object reference handle, the object’s path should get renamed ...
Multicast RPCs may be sent to clients in a different level with Replication Graph
UE - Framework - Networking - Jan 20, 2026UReplicationGraph::ProcessRemoteFunction does not check if the client has the same loaded world as the server when sending a multicast RPCs. For actors that are persisted partway through a seamless ...
Detaching a component may not be replicated to clients
UE - Framework - Networking - Jan 13, 2026Because the archetype for scene/static mesh components has a null value for AttachParent, there are some situations where changes to a replicated component's AttachParent are not replicated to clien ...