Unreal Engine Issues
Unreal Engine Issues
Iris - Initially dormant actors not replicated if dormancy is not enabled
UE - Networking - Iris - 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 - Networking - Iris - 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 ...
"Could not find static actor" errors on standalone editor client when connecting to PIE server
UE - Networking - Iris - 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 ...
Iris - Ensure hit when destroying a torn off actor from AActor::TornOff
UE - Networking - Iris - Dec 11, 2025As of CL 42014318, StopReplication requests that occur during ReceiveUpdate are delayed until all received data from the update is finished processing, including if the actor is torn off. However, i ...
Iris - BeginPlay not called on client for statically placed, low-priority replicated actor
UE - Networking - Iris - Dec 11, 2025On the client, NotifyBeginPlay is triggered via AGameStateBase::OnRep_ReplicatedHasBegunPlay. However, if a replicated actor is waiting on its initial replicated state to be received and applied (bA ...
Iris - Server fails to send client initialization RPCs after seamless travel if the client finishes travelling first
UE - Networking - Iris - Nov 18, 2025During seamless travel, when a client loads into the destination level it will call APlayerController::ServerNotifyLoadedWorld, including when it finishes the travel before the server. When the serv ...
DeltaCompressionBaselineManager needs to update its scope for minimal update
UE - Networking - Iris - Sep 29, 2025DeltaCompressionBaselineManager needs to update its scope for the case where objects may be replicated but no connections exist. ...
Iris - actors spawned/loaded before a connection exists will not use delta compression
UE - Networking - Iris - Sep 24, 2025FDeltaCompressionBaselineManager::CreateBaseline will return early if the object has an invalid ObjectInfoIndex, which is allocated in FDeltaCompressionBaselineManager::UpdateScope (by calling FDelt ...
Iris - removal of fast array item not performed on client when server array contains a non-replicated item
UE - Networking - Iris - Sep 8, 2025It is possible to add items to a replicated fast array that are not intended to be replicated to the clients. For example, FGameplayAbilitySpecContainer has a custom ShouldWriteFastArrayItem impleme ...
Iris - RPCs split into partial blobs aren't received on non-replicated components
UE - Networking - Iris - Aug 5, 2025This issue does not occur if the RPC is not split into partial blobs. The RPC is received on the non-replicated component if Iris is disabled. ...