Unreal Engine Issues

Crash during garbage collection when container UPROPERTIES specify raw interface pointer element types without TScriptInterface wrapper

When a UPROPERTY() TMap or TArray has raw interface pointers as element type, the garbage collector tries to handle them and crashes. For raw interface pointers without a container, UHT generates a ...

Material overrides not respected when generating HLODs.

When generating HLODs, it is possible for the generator to ignore material override settings. The generator will not respect the constants, and does not change them in the Material with a default se ...

Sequencer: Skeletal Animation with montages can cause blending issues when re-playing the same sequence on the same character

The code in MovieSceneSkeletalAnimationSystem.cpp storages montage data on a per skeletal mesh component, per section basis. This (and a few other bits of logic) cause issues for external UDN user w ...

Material Graph Editor crash when changing the value of a node entering a reentrant expression

It is possible to cause an editor crash when changing a the value of a node involved with a reentrant expression. See the steps to reproduce for more information. Specifically, the crash occurs whe ...

Modify AVolume brush shape dirties level

Changing the brush shape of an AVolume external actor dirties the level. ...

FBX exporter does not support Level instances

Material functions should be able to output the same data as it can accept as inputs

Material Functions cannot output Texture Objects or Booleans. This seems to be because the Material Editor believes that the outputs are Floats, and forbid connections to inputs that take Textures ...

Setting AnimationMode to "UseAnimationAsset" inside Sequencer might not be set properly.

Adding a new key inside a LevelSequence that changes the AnimationMode of a SkeletalMesh to "Use Animation Asset" can bug out the AnimationMode constantly change between "UseCustomMode" and "UseAnim ...

Subsurface Scattering Checkerboard with SceneColourFormat 3 (High Scalability) leads to a visual artefact when temporal upscaling is in use

Primarily visible at very low internal resolutions (25-33%), the SSS checkerboard with an RGB scene colour format (r.SceneColorFormat 3) causes a double-image artefact both internally and on the sil ...

When an NiagaraParameterCollection asset is duplicated or when its namespace is changed, any existing parameters get incorrectly duplicated/renamed with the addition of the namespace prefix

When an NPC asset is duplicated, the ne wasset gets incorrectly duplicated parameters: one set with the correct names, and one set with the original namespace prefix embedded into the names. These i ...