Unreal Engine Issues

[AI] Failed check in UMassSpawnerSubsystem::DestroyEntities due to EntityManager still procesing

It crashed when unspawning an AI which will destroy its entity. Inside DestroyEntities "IsProcessing" is true, but when it breaks into the debugger, "ProcessingScopeCount" is 0 (so IsProcessing shou ...

ensure(PinHelpers::UnresolvedPins.Num() == 0); fails after undoing in the editor

The underlying cause is some edge case involving a math expression node, which does some perhaps naive things with a contained graph. ...

Crash when changing r.MaterialQualityLevel when FastGeo plugin enabled in cooked build

The engine crashes when the r.MaterialQualityLevel is changed in a cooked game that uses the FastGeo Streaming Plugin. The crash doesn't repro with the same steps in Editor, just in a cooked build. ...

Some operations on material instances do not transmit over transactions.

Crash when calling SetState inside state machine OnUpdate

The crash happens when SetState is called inside the function bound to OutputAnimationPose’s OnUpdate in the animation state. This way of using Set State node is the same as shown in the official do ...

Client and server can both get stuck waiting for packet sequence history flush

The issue occurs when both instances have a significant difference between their last sent and last ack'd sequence number, as they will begin waiting for the sequence history to be flushed for a pac ...

Sequencer is not taking into account the TransformOriginOffset of the level sequence actor.

When a level sequence actor has camera's marked for preroll in it and information is gathered for a camera cuts location to send to the streaming manager, it does not take into account the Transform ...

Find in Blueprints: Default values of TMap keys are not returned

Context Find-in-Blueprints can be used to search the current, or all, blueprints. If you enter a simple string, it would return nodes, pins, pin default values and default values for BP Variables ( ...

When ControlRig.EnableAnimNodePerformanceOptimizations is enabled, the default pose briefly appears after the Control Rig is reinitialized

Since UE5.6, ControlRig.EnableAnimNodePerformanceOptimizations is enabled by default, and this appears to be causing the issue. Specifically, when the control rig’s construction event is processed, ...

Crash when running "MAP REBUILD ALLVISIBLE" with hidden sublevels and then changing maps

Running the MAP REBUILD ALLVISIBLE editor command when the current map contains hidden sublevels causes a crash upon changing maps. The issue seems to be related to hidden sublevels being cleared in ...