Unreal Engine Issues
Unreal Engine Issues
Chaos Fields: LS_MasterField continuously creates components every frame and never cleans them up
UE - Runtime - Deformable - Mar 25, 2026While active and ticking, the built-in FS_MasterField actor instance continuously creates several new components every frame, which are never cleaned up until the actor is destroyed. This can happen ...
LevelStreamingPersistence: BP added components don't persist properties in PIE until map actor resave
UE - Engine Scaling - Streaming - Mar 6, 2026Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors, components and other objects that are part of a streamed level. Persisted properties are resto ...
Missing logging or error when applying an anim instance to a skeleton that the anim instance doesn't match.
UE - Runtime - Animation - Feb 9, 2026Currently, we detect whether an anim instance is supported by the skeletal mesh and, if it isn't, unreference the instance, but we don't error or warn the user that this happened. This leads to conf ...
SaveGeneratedTexture2DAsset can crash when overwriting an existing asset
UE - Texture - Nov 28, 2025SaveGeneratedTexture2DAsset can crash for a variety of reasons when overwriting an existing texture asset. When no existing asset exists, the function simply moves the provided transient Texture ass ...
Ray tracing scene doesn't reflect WPO with instance custom data
UE - Rendering - Features - Ray Tracing - Sep 19, 2025When custom instance data is used to calculate WPO in a Material and applied to an ISM the WPO value in the Lumen scene (ray tracing scene) is different than the visible scene resulting in incorrect ...
Multiple setter functions in UMaterialEditingLibrary always return false even when the parameter is correctly set on the MaterialInstance.
UE - Rendering - Architecture - Materials - May 30, 2025In Unreal Engine, materials can expose parameters that can then be modified via instances (MaterialInstanceConstant). The UMaterialEditingLibrary provides several functions to modify these parameter ...
Search field in 'Quickly Add to Project' fails with Chinese Pinyin input unless manually focused
UE - AI Workflows - UI Systems - Localization - May 28, 2025A licensee reported that under the Chinese language setting in UE5, using the “Quickly Add to Project” button results in incorrect or ignored input when entering text via Pinyin IME. If the user sta ...
Memory leak in global distance field when bDisableWorldRendering=true
UE - Rendering - Features - Jan 7, 2025A memory leak occurs in global distance fields when bDisableWorldRendering=true As a workaround until this is fixed, you can disable the logic that checks bUpdatedThisFrame *in *GlobalDistanceField ...
Biquad Filter is incorrect when bandpass is 1.0
UE - Audio - Aug 20, 2024The bandwidth on the biquad loepass filter is cutting frequencies well below 20kHz when the bandwidth is 1.0. Slack convo: [Link Removed] Visualization:[Image Removed] ...
Crash on FPBDIslandManager::Reset() when exiting PIE
UE - Runtime - Simulation - May 21, 2024The editor might crash when stopping PIE in some scenarios ...