Unreal Engine Issues
Unreal Engine Issues
Light Leak Issue in Modular Buildings (Lumen HZBTraversal)
UE - Graphics Features - Lumen - Oct 14, 2025Starting in Unreal Engine 5.6, disabling "r.Lumen.ScreenProbeGather.ScreenTraces.HZBTraversal" can lead to light leaking between adjacent or overlapping meshes. Also tested on Release-5.6, CL: 4523 ...
Ensure in FOnlineSubsystemSteam::Shutdown when using OSS Adapter
UE - Online - Oct 13, 2025This looks to occur because of the order in which the OSS Adapter module and Steam OSS module are shut down. The OSS Adapter holds onto references to the OSS's interfaces, so when the Steam OSS modu ...
Typo in "BaseEditorSettings.ini": under section [/Script/UnrealEd.ContentBrowserSettings], key "DisplayPluginFolder" (singular) should read "DisplayPluginFolders" (plural).
UE - Editor - Workflow Systems - Oct 11, 2025File "<ENGINE_PATH>/Engine/Config/BaseEditorSettings.ini" contains the following setting: [/Script/UnrealEd.ContentBrowserSettings] ; Whether to display the game project plugins in the Content Brow ...
Ensure triggered in FBoundsCacheElement::GetValue when adding ISM instances in Construction Script
UE - AI - Oct 8, 2025An ensure is triggered in FBoundsCacheElement::GetValue when adding instances to an InstancedStaticMeshComponent inside a Blueprint’s Construction Script. This occurs when the ISM component is navig ...
CppCompileWarningSettings.NonInlinedGenCppWarningLevel messages should contain Warning\Error
UE - Foundation - Cpp Tools - UnrealBuildTool - Oct 8, 2025The messages emitted when CppCompileWarningSettings.NonInlinedGenCppWarningLevel is set to Warning\Error should contain the literal so the tools pick them up and react accordingly. From the EPS c ...
Crash at compile time when using a VariableSet node with a local variable created by pasting a private property
UE - Framework - Blueprint - Oct 7, 2025When a property is created in this way, a local variable with a Private flag is generated. Since such a variable is generally not desirable, it would be better to remove the Private flag upon pastin ...
[Material Substitution] Missing Material IDs in exported CSV in 2025.2
TM - Interoperability - Oct 7, 2025Reported in SF [Link Removed] When exporting material IDs in 2025.2, downloaded materials appear to be missing from the exported CSV. In 2025.2, it appears that only local materials are included i ...
Long load time for files with large numbers of trees in 2025.2
TM - Core - Oct 6, 2025Reported in SF [Link Removed] User reports that multiple files with large amounts of trees take substantially longer to load in TM 2025.2 compared to 2025.1.1. Confirmed with one of the user's fil ...
Import then cancel while file is read leads to potential crash
TM - Interoperability - Oct 6, 20251/ Import a file with mootools such as an fbx 2/ while the file is still read, cancel the import Result : may crash few times after (when theoretically the file has finished being read) - not repr ...