Unreal Engine Issues
Unreal Engine Issues
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 ...
Division by zero causing NaN/Inf on USkeletalMeshComponent::UpdateRigidBodyScaling() when setting scale to zero and back
UE - Runtime - Simulation - Feb 11, 2026Up to UE 5.5, skeletal mesh physics did not get updated when the component's scale changed. This was improved on January 2025 with CL 39190335, which addressed [Link Removed] ...
Enum Compare Condition causes crash when resetting default value of right field in State Tree's Enter Conditions
UE - AI - StateTree - Feb 11, 2026In FStateTreeCompareEnumCondition::GetDescription, the Left.Enum value is mistakingly used when setting the RightValue. This causes crashes when resetting the default value of the Right field in an ...
FDetailGroup::AddGroup does not correctly apply the default expansion state for DetailGroups
UE - Editor - Verse Class Editor - Feb 10, 2026There is a bug affecting DetailGroups in the engine. When adding child DetailGroups to a parent DetailGroup, the expansion state does not behave as expected and ignores the flags intended to control ...
Directly opening a modified map asset of a streaming sublevel does not always force it to be reloaded (inconsistent with other map open behaviors)
UE - Engine Scaling - Streaming - Feb 10, 2026When the level currently being edited has unsaved changes and the user opens a new one, the Editor asks if the changes should be saved. If the user answers negatively, the level asset is reverted to ...
The editor crashes to Assertion Failed after enabling a light's "Lighting Channels" from the "Light Mixer" panel
UE - CAPT - Tools - Feb 9, 2026The crash only occurs when enabling the channels of lights that are part of the "BP_SphereLight" or "SM_CubeLight". Enabling the channels of a single "PointLight" or "SpotLight" doesn't crash the ed ...
Client disconnected due to MissingLevelPackage in editor with Iris and server streaming enabled
UE - Engine Scaling - Streaming - World Partition - Feb 9, 2026When connecting to the server, if the client activates some local cells while the connection is still pending, ULevelStreaming::IsConcernedByNetVisibilityTransactionAck will return false. In this ca ...
MRG - Additional Post Process Render have a black alpha channel
zComponent - Archive - Feb 7, 2026Additional Post Process renders always have a black alpha channel ...