Unreal Engine Issues

Flushing Level Streaming Can Trigger Actor Initialization during World Teardown

From licensee: We've recently encountered an issue where BeginPlay was called on an Actor while the World is being torn down. This seems to stem from flushing level streaming while it has levels th ...

FTickTaskLevel::RescheduleForIntervalParallel Crash

Short description from Licensee (attached UDN has more info):When streaming a level in and/or out (out especially in World Partition due to the bRequireFullVisibilityToRender variable usage) there i ...

Client cannot find LevelStreaming in editor mode

From licensee: When we run MainMap (NM-Standalone) and then open GameMap to play (options - listen). When the client joins the server, it won't be able to find the LevelStreaming in GameMap (see - ...

Optimize FActorFolders when there's level streaming in PIE.

This will need more investigation, but at least in PIE (to check if we can do the same in editor), when a level is streamed-in, we should only add the new missing folders for this level and when str ...

World Partition Editor minimap build failed

The issue was reproduced when building a minimap for an open world level with no Actors with "Is Spatially Loaded" enabled. Placing additional Actors with "Is Spatially Loaded" enabled in the level ...

Compilation error in Mac editor builds when adding UWorld::IsStreamingLevelBeingConsidered function

This code passes the build when compiled using the windows editor (Visual Studio), but fails when compiled using the mac editor (XCode). Adding ENGINE_API to struct FStreamingLevelsToConsider and ex ...

[Ensure] LoadStreamingLevel and UnloadStreamingLevel are called at the same tick

There is no particular error. Developer can ignore it. ...

Mesh reduction modules selection aren't properly applied on engine restart

Recent changes in the MeshReductionManagerModule::StartupModule() have introduced issues where it won't respect what reduction modules have been set in the config file. This is a big issue for plugi ...

Validate whether the usage of FPIEFixupSerializer can be removed from UWorld::DuplicateWorldForPIE

Add support for referencing non-spatially loaded actors without clustering them together.

The engine doesn't allow cross-level references as it assumes a referenced object is immediately available which we guarantee by placing any reference clusters into the same cells. This means the be ...