Unreal Engine Issues
Unreal Engine Issues
UIScene support to 4.27+
UE - Platform - Mobile - Systems - Oct 22, 2026Sequencer frame range progression is not continuous
zComponent - Archive - Oct 28, 2021The end of the level visibility section places a DeterminismFence. This causes the issue. The fence clips the frame range and produces a discontinuous frame ranges, e.g. 23201~24000, then 24001~24 ...
Niagara Data Interface "Errors and Warning" section on Module Details not updating when error messages change
UE - Rendering - Architecture - Niagara - Aug 14, 2025This is a regression: it worked correctly up to UE 5.5, but not in 5.6 or mainline latest. Possibly caused by CL 40093049. Class UNiagaraDataInterface provides virtual method GetFeedback(), which a ...
Fix center of mass calculations with welding.
UE - Simulation - Physics - Aug 25, 2016Welding components uses precomputed weights for to determine center of mass for the actor. This can cause problems when users want to specify custom weights for certain components. ...
Fix InstancedStaticMesh RemoveInstance invalidating indices
UE - Gameplay - Oct 26, 2016When removing instances from an ISMC, indices / indexes returned from AddInstance will be invalidated. This can cause issues for users that want to do custom management of instances. Using something ...
Investigate/Fix incremental component unregister
UE - Gameplay - Mar 11, 2020Streaming a level back in before it finishes streaming out behaves undesirably. When a level is streamed out the actors/components in the level are incrementally unregistered over multiple frames. ...
Fix primitive uniform buffer validation.
UE - Rendering - RHI - Jul 31, 2020GPUScene primitive validation is currently busted and asserts. It looks like there are two problems: 1) NaN's in the entries can cause comparison issues, so a MemCmp would be better. 2) There's a ...
Fix TSR velocity extrusion on rotating
UE - Rendering - Features - Aug 3, 2023MPCook: Fix replication of UObject::CookAdditionalFilesOverride
UE - Core - Data Pipeline - Cooker - Oct 19, 2023MPCook relies on global data that is accumulated during package cooks on CookWorkers be replicated to the CookDirector. Some global data that is accumulated during package cooks is CookAdditionalFi ...