Unreal Engine Issues

Crash when using ConstructorHelpers on Niagara assets

When using the ConstructorHelpers templated function, FObjectFinder, with Niagara assets, the editor crashes. Tested in 4.21.2 (CL - 4753647), 4.22 (CL  - 5660361),  4.23 (CL - 5806860) ...

Disabling fog in Unlit mode does not work

The Show Flags for Fog no longer function correctly when in Unlit mode. Tested in 4.21.2 (CL - 4753647), 4.22.2 (CL - 6574378), 4.23 (CL - 6925347) ...

UGameplayAbility::ConfirmTaskByInstanceName() has incorrect code comment

UGameplayAbility::ConfirmTaskByInstanceName() has an incorrect code comment that was copied and pasted from UGameplayAbility::CancelAbility(). The comment for UGameplayAbility::ConfirmTaskByInstance ...

UV Rotation does not work for video materials

The rotation parameter of video materials does not function in Twinmotion 2024.1.2 and Twinmotion 2025.1 PR. Adjusting the slider does not have any effect. Feature last worked in Twinmotion 2023.2 ...

UGameUserSettings::ValidateSettings fails to wipe GameUserSettings.ini

When changing the version in UGameUserSettings, the expected behaviour is that GameUserSettings.ini will be wiped/delete and then regenerated. The actual behaviour is that within the ValidateSetting ...

FFunctionalTestingModule::GetMapTests does not support World partition

Fbx Importer crash if answering no to the incompatible skeleton dialog

Quote from the licensee (FbxSkeletalMeshImport.cpp inside "// merge bones to the selected skeleton"): this happens because in UnFbx::FFbxImporter::SetupAnimationDataFromMesh, the function FindFBXMe ...

Flickering / Color Shift in Right eye with Cascade Particle + Instanced Stereo

Flickering or shifted color will be seen in the Right Eye. User reports that moving the nodes from the material function to the base graph resolves the issue. Confirmed in 4.23 MAIN branch @ CL 6 ...

incorrect virtual texture shader code(in FinalizeVirtualTextureFeedback) on Mobile forward platform

in the function FinalizeVirtualTextureFeedback, the micro "USE_DBUFFER && MATERIALDECALRESPONSEMASK" returns true on mobile forward, while there is no DBUFFER on Mobile forward obviously. This takes ...

MoviePipeline: Can't inherit from UMoviePipelineSetting in BP due to PURE_VIRTUAL

IsValidOnMaster/IsValidOnShot need to be BlueprintNativeEvents with a default C++ implementation and allow derived classes to override the function. This is needed so that you can create custom set ...