Unreal Engine Issues and Bug Tracker

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Latest Bugs

Substrate: FPrimitiveViewRelevance::operator|= bitwise-ORs SubstrateUintPerPixel, inflating the per-pixel byte count and asserting under the blendable GBuffer

UE - Rendering - Architecture - Materials

A crash can occur due to this check in Substrate.cpp when a material with 2 units and a material with 5 (20 bpp) uints are combined triggering...

[SSAM]Textures that are still compiling are all counted as UnknownRef

UE - World Creation - Worldbuilding Tools

In UE5.8, the texture scale fallback is no longer applied when SSAM is enabled. As a result, if a material cannot access its TextureStreamingD...

FDebug::EnsureFailed will only broadcast OnHandleSystemEnsure 4 times.

UE - Core - Systems

A licensee is reporting that OnHandleSystemEnsure will only be broadcasted for the first 4 ensures in the life of the process. This is hardcod...

Montage preview does not stop the previous montage from another slot group

UE - Runtime - Animation

In the Animation Editor, when you open a montage that uses a different slot group, the previous montage keeps playing in the preview, and its ...

Camera Component - Regression in Unreal 5.7+

UE - QA - Support

POST BODY:Summary Hey there - I’ve been sticking with Unreal Engine 5.6 for cinematics because of a regression that's been made to CineCameraA...

Latest Fixes

[Niagara][5.8] Data Channel Read and Write register with an identical type hash when fx.Niagara.DataChannels.Enabled is set from ini, hitting checkf in FNiagaraTypeRegistry::RegisterTypeInternal

UE - Rendering - Architecture - Niagara

Affects: 5.8 (verified on Release-5.8), Windows, EditorSummary Adding fx.Niagara.DataChannels.Enabled=true to an ini file makes the Niagara e...

Scrubbing the timeline in Sequencer can hang the editor when operating on constrained actors with complex control rigs

UE - ACT Character - Anim in Engine

The issue is caused by UAnimDetailsProxyManager::ForceUpdateProxyValue triggering evaluation of constraints that are attached to control rigs....

Chaos Mover crash in standalone editor client

UE - Runtime - Character

When using the Chaos Mover with resimulation enabled, standalone editor processes running as a client will crash around 80% of the time upon s...

Unexpected offset when using attach tracks with scene root components

UE - ACT Character - Sequencer

We noticed an inconsistency when using attach tracks, depending on whether or not the parent actor has a default scene root. This creates an u...

ObjectScale node in the material editor does not work with decals

UE - Rendering - Architecture

The ObjectScale node does not output the correct values in the material editor. This method works to tile images with a Surface Material Domai...