Unreal Engine Issues

Crash when Playing in Mobile Preview with Capsule Direct Shadows

When Capsule Direct Shadows are enable, attempting to play in Mobile Preview will cause the preview to crash. ...

Packaged project crashes when playing sound from blueprint library with enum input after nativizing blueprints

Packaged project crashes when playing sound from blueprint library with enum input after nativizing blueprints. Frequency: 5/5 Notes If nativize blueprints is turned off, the packaged project wor ...

Stop>Set Sequence>Play causes spawnables to be duplicated

Stop>Set Sequence>Play causes spawnables to be duplicated There is an alternate repro (see attached image) that uses Create Level Sequence Player, but that one seems expected since it is, well, cre ...

REGRESSION: HierarchicalInstancedStaticMeshComponent LOD transitions are broken in 4.9 and Main

While testing another fix I noticed HISM LOD transitions are not working in Main or 4.9 branch. There is no screen-door effect and multiple LODs seem to be rendering simultaneously compared to 4.8. ...

Animation sub instances tick twice with a post processing BP

An animation's sub instances will tick twice per frame if a post processing BP is set. ...

ABI break in Pixel Streaming appearing in Packaged builds

WebRTC binaries do not have the correct headers and the headers need to be updated. Linux binaries also need to be updated to match the new headers. ...

[AI] Destroying an actor while using pooled actors with MassActorSpawnerSubsystem causes a nullptr exception crash

If an actor that is used in the pooled actor list of UMassActorSpawnerSubsystem is destroyed, it causes a nullptr exception in UMassActorSpawnerSubsystem::SpawnOrRetrieveFromPool. The subsystem atte ...

Small UInstancedStaticMeshComponent::UpdateInstanceTransformById bug

The call to UpdateInstanceTransform within UInstancedStaticMeshComponent::UpdateInstanceTransformById(..) sends bTeleport in place of bMarkRenderStateDirty that was added as part of Unreal Engine 5. ...

Assert when compilling blueprint with interface implemented

Crashing when toggling maps containing Color Correct Regions

When maps with Color Correct Regions are streamed into another map have their visibility toggled during runtime, it will cause a memory access violation and crash the editor. ...