Unreal Engine Issues
Unreal Engine Issues
Creating/Destroying UWorlds rapidly can cause dangling pointers from UAutoDestroySubsystem
UE - Gameplay - Aug 10, 2020To summarize what I'm seeing there, a bunch of UObjects relating to that world have been destroyed but not all destructed. The UAutoDestroySubsystem pointer is still on the static tickable list, and ...
Performance Regression in Forward Rendering with most settings off.
UE - Rendering - Architecture - RHI - Mar 12, 2020When rendering with forward rendering, the ComposeSeparateTranslucency call is called even when separate translucency is not enabled. Additionally, Downsample.HalfResolutionSceenColor gets called ev ...
Crash when using automated groom import
UE - Editor - Content Pipeline - Import and Export - Jan 5, 2021UDN customer reported that using automated groom import through Blueprint was crashing. This can probably be reproduced with a Python script using an asset import task with the automated flag set to ...
Collision lost from body when using world composition and streaming
UE - Simulation - Core - Mar 1, 2021Physics object from a streamed level does not interact with other physics objects in persistent level. ...
Platform-specific defines not picked up by Intellisense
UE - Foundation - Cpp Tools - UnrealBuildTool - Aug 31, 2022With the way PLATFORM_XSX, PLATFORM_PS5 etc. are defined, it seems intellisense doesn't know about them, because the .vcxproj only references the Win64 version of Definitions.h, and they are defined ...
FMaterialResource::IsDualBlendingEnabled bug
UE - Rendering - Architecture - Materials - Jul 24, 2023The user has a proposed fix for this in the case. FMaterialResource::IsDualBlendingEnabled needs the following modification that includes MaterialInstance check: bool bMaterialRequestsDualSourceBle ...
Crash in FPipelineFileCacheManager::RegisterPSOStats
UE - Rendering - Architecture - Oct 25, 2024The game can crash when one thread clears RunTimeToPSOUsage while another thread is expecting it to contain a PSO it is registering stats for. Thread A: calls CacheGraphicsPSO() Thread B: calls C ...
The visibility state of on-screen stat messages is not restored correctly after entering and leaving PIE. This also affects other important on-screen messages like map warnings and debug messages.
UE - Editor - UI Systems - Nov 28, 2024Currently, the ShowStats viewport option is automatically enabled when entering PIE and automatically disabled when exiting PIE. This forced disabling happens even if the option was enabled prior to ...
Changing the scale of a single HISM instance greatly affects the LOD selection of all instances
UE - Rendering - Architecture - Sep 22, 2025When using ISMs and HISMs, each instance can have its own transform, which can affect the LOD selection of one or more instances. For HISMs in particular, changing the scale of a single instance gre ...
FDetailGroup::AddGroup does not correctly apply the default expansion state for DetailGroups
UE - Editor - Workflow Systems - Feb 10, 2026There is a bug affecting DetailGroups in the engine. When adding child DetailGroups to a parent DetailGroup, the expansion state does not behave as expected and ignores the flags intended to control ...