Unreal Engine Issues
Unreal Engine Issues
WorldPartition: Attached Actors within Level Instances save level offset bounds
UE - World Creation - Worldbuilding Tools - Level Instances - May 9, 2023The proposed fix is implemented in CL 25389340 but needs further testing to make sure there are no issues caused by it. ...
WorldPartitionActorDescs for LevelInstanceActors are broken when migrating world partitioned level
UE - World Creation - Worldbuilding Tools - Level Instances - Jun 13, 2023WorldPartionActorDescs will be restored to the correct properties when resaved. They can also be fixed by the WorldPartitionResaveActorsBuilder commandlet. ...
CreatePatchLibrary is broken
UE - Rendering - Architecture - Shaders - Nov 12, 2025It seems the FEditorShaderCodeArchive.LoadExistingShaderCodeLibrary missed some functions, use FEditorShaderCodeArchive.AddShaderCodeLibraryFromDirectory instead could fix the issue. ...
Megalights support for anisotropic materials
UE - Rendering - Graphics Features - Lumen - Apr 14, 2026A licensee noticed that SUPPORTS_ANISOTROPIC_MATERIALS is not passed to FShadeLightSamplesCS::ModifyCompilationEnvironment for MegaLights ShadeLightSampleCS. Adding it fixes the issue. ...
Behavior tree assets marked dirty when opening in subeditor
UE - AI - Aug 16, 2016Found while I was fixing up other content, that Behavior Tree assets are being marked dirty by just opening them into sub editor. ...
Moving or renaming a file in the editor should execute a Perforce move command not a delete+add
Tools - Aug 31, 2016Moving or renaming a file in the editor erases its perforce history. It should execute a move not a delete + add to fix this ...
Hot reload iteration time regression.
UE - Foundation - Core - Oct 19, 2017Hot reload iteration times have been crippled ever since CL# 3332960, which was a fix for [Link Removed]. ...
IOS-Shipping memory managentment failed for std::string
UE - Platform - Mobile - Oct 8, 2018[Image Removed] [Image Removed] [Image Removed] if strip with -x option, it will fix this issue. ...
PLCrashReporter iOS Bitcode packaging Error
UE - Platform - Mobile - Mar 6, 2019Unable to package a CPP project with Bitcode enabled Confirmed in 4.23 MAIN @ CL 5291468 ...
Mobile VR - Foliage (HISM) crash
UE - Platform - XR - Jun 7, 2019HISMs cause mobile VR app to crash. Confirmed in 4.23 MAIN @ CL 6829265 ...