Unreal Engine Issues
Unreal Engine Issues
MovieSceneSequencePlayer GetEndTime() reports incorrect end time
UE - CAPT - Sequencer - Jul 28, 2026We've noticed an inconsistency with UMovieSceneSequencePlayer::GetEndTime(). It does not take into account DurationSubFrames. See UMovieSceneSequencePlayer::GetDuration() for comparison. Also, the c ...
GPU Validation texture barrier errors for SkyAtmosphere component
UE - Rendering - RHI - Jul 20, 2026A licensee reported that two SkyAtmosphere texture resources do not have proper memory transitions added by the RDG. This happens because in VolumetricCloud.usf, these textures are referenced via Vi ...
Crash in GC - FSharedStruct reachability race condition
UE - Core - Systems - Jul 13, 2026This Jira was created from the linked EPS case: =============================================== This issue is caused by FSharedStruct batching reachability requests to the same underlying FInstan ...
UserSceneTexture not working in Virtual Reality
UE - Platform - XR - Jun 25, 2026User reports that UserSceneTextures used in Post Process Materials are only correctly rendered inside the left eye in VR. ...
Parameter metadata not accessible if modified in Material Instance and then converted to CustomPrimitiveData
UE - Rendering - Architecture - Materials - Jun 24, 2026There’s a potential issue with some changes we made to UMaterialInstance::GetParameterValue (https://github.com/EpicGames/UnrealEngine/commit/8f2bebb008ba645f5938da844cd46b0925322b13). It seems as t ...
Rare crash in FWidgetAnimationState::OnStopped
zComponent - Archive - Jun 22, 2026The FWidgetAnimationState::OnStopped delegate is getting created when the widget anim state is being destroyed and then queued to be executed later. Something is happening between the queue and the ...
Crash when using ListStreamingTextures with VirtualTexturePrefetchMips
UE - Rendering - Architecture - Jun 16, 2026The ListStreamingTextures command causes a crash in FRenderAssetStreamingManager::HandleListStreamingRenderAssetsCommand when there is a virtual texture that uses crashes when encountering one of t ...
Substrate Single Layer Water material fails to compile in blendable Gbuffer mode when using the Single Layer Water BSDF node
UE - Graphics Tools - Terrain - Water - Jun 16, 2026When using Substrate in Blendable GBuffer mode, a material with the single layer water BSDF node produces a shader compiler error : MaterialEditorStats: Error: [SM6] Shader debug info dumped to: "\ ...
[StateTree] StateTree fails to transition to the next state in child states when parent state contains some tasks
UE - AI - StateTree - Jun 12, 2026StateTree fails to transition to the next child state in a tree where the parent state has a task such as Debug Text which does not influence state completion. The ST atttempts to transition from Le ...
Custom Items and Inventory can appear enabled while actually being disabled
UE - Gameplay - System - Jun 10, 2026Toggling the Custom Items and Inventory setting and then closing the editor without saving can lead to a mismatch between the Project Settings Custom Items feature and the IslandSettings object in t ...