Unreal Engine Issues
Unreal Engine Issues
FFastArraySerializer::DeltaFlags may be saved to blueprint CDO, causing delta struct serialization to be skipped
UE - Networking - Mar 28, 2025When an actor's replicator is first created and initialized, FObjectReplicator::InitWithObject will use the archetype as the source object for copying the properties. From there, the custom delta pr ...
COND_InitialOnly property not written to first replay checkpoint after being changed
UE - Networking - Feb 5, 2025When recording a checkpoint, it is treated as an initial replication, as all the changed properties since the channel was opened need to be recorded. This normally results in any initial only proper ...
Check hit when setting push-model array from a different actor's blueprint
UE - Networking - Jan 31, 2025This is due to the same reason behind [Link Removed], as the stack object is passed to MARK_PROPERTY_DIRTY rather than the array property's owner. ...
UEditorEngine::AddPendingLateJoinClient checks original PIE/SIE state, not current state
UE - Networking - Jan 27, 2025When adding late joining clients, the engine checks the originally requested EPlaySessionWorldType, rather than checking whether or not the session is currently simulating or not. This means if the ...
NetUpdateFrequency Affected by Global Time Dilation
UE - Networking - Jan 13, 2025Changing the global time dilation in a multiplayer game affects the rate at which actors are considered for replication, and setting it to 0 will even cause replication to stop entirely (unless the ...
Ejecting from player in multiplayer PIE results in the wrong world being displayed
UE - Networking - Dec 13, 2024In [Link Removed], it mentions that only the instance in the editor viewport supports switching to Simulate In Editor when running multiple instances in PIE. However, rather than showing that instan ...
No warning given when a subobject is registered to a component not using the registered subobjects list
UE - Networking - Nov 15, 2024AActor::AddReplicatedSubObject will ensure in this case if the actor doesn't set bReplicateUsingRegisteredSubObjectList, but there is no equivalent check in AActor::AddActorComponentReplicatedSubObj ...
Changing a push model property without marking it as dirty can cause desync when the actor goes in and out of dormancy
UE - Networking - Oct 4, 2024When the actor goes out of dormancy, it will replicate its push model property, even if it hasn't been marked as dirty. In this case, it seems the value of the property is not written to the shadow ...
Default subobject of dynamic component skips initial replication
UE - Networking - Sep 11, 2024Because the component's subobjects are replicated before the component, the content block for the subobject is received before the component has been created on the client. Since this subobject is c ...
Server only network emulation settings applied to client on travel
UE - Networking - Sep 4, 2024It looks like the "Server Only" emulation settings are being applied to the client after a travel. When doing a server travel with the TRAVEL_Relative travel type, the NextURL created in AGameModeBa ...