Unreal Engine Issues
Unreal Engine Issues
FBX imported skeletal mesh has incorrect axis directions
UE - Editor - Content Pipeline - Import and Export - Aug 20, 2019The axis the FBX is imported with has been inversed from prior versions. See attached screenshots. This causes issues specifically with vehicles, where the movement is happening into the forward dir ...
Undo and ConstructionScript break the AttachChildren array
UE - Framework - Components - Nov 14, 2019Undo fills AttachChildren array with null by the undo serializer. After that, a construction script tries to remove child components from parent component's AttachChildren but it can't find its poi ...
UMG Crashes When Using "Create Dynamic Material Instance" With An Optional Name Twice
UE - Editor - UI Systems - Feb 17, 2020When using an Optional Name parameter in Create Dynamic Material Instance while using the same Optional Name twice in UMG the engine crashes. I have tested this in a actor blueprint that applies th ...
Networking Engine Tests fail for NotifyParamCorrect on Client
UE - Networking - Oct 2, 2019The following errors occur when running the networking engine tests with 2 clients and a dedicated server. LogFunctionalTest: Error: Assertion failed: 'EngineTestNetActorComponent bRepArrayAddNotif ...
Input isn't recognized for Shift+F, or just the F key when the Shift key is also pressed down
UE - Gameplay - Input - Nov 23, 2021This is a regression Tested in: //UE4/Release-4.26.2 CL15973114 Binary - Did not reproduced //UE4/Release-4.27.1 CL17735300 Binary - Reproduced //UE5/Release-5.0-EarlyAccess CL16682836 Binary - Repr ...
Ocean does not completely fill water zone in certain circumstances
UE - Graphics Tools - Terrain - Water - Jan 26, 2023Issue reported in [Link Removed] by [Link Removed] 1. Add one component to the 8K Landscape. [Image Removed] 2. Adding Ocean will not render correctly. [Image Removed] [Image Removed] These ca ...
Anim Graph will hang if the Draw Debug Sphere and Set node are connected and compiled
UE - Runtime - Anim BP - Jun 8, 2023anim blueprint hangs when compiled. Probably a cyclic issue when compiling. A workaround is to add a delay of any time between the set node and the Draw Debug Sphere node. Repros in the following v ...
Datasmith - Lights imported with incorrect transforms
TM - Interoperability - May 6, 2025Reported in SF [Link Removed] In Twinmotion 2025.1.1, lights imported through Datasmith appear with incorrect transforms. Lights will appear rotated 90 degrees about the Y axis with an offset. Test ...
FInstancedStruct member uproperties are not cached when "Generate Optimized Blueprint Component Data" is enabled
UE - Framework - Blueprint - Nov 18, 2025A licensee has encountered an issue where their FInstancedStruct isn't being gathered into CachedPropertyData when "Generate Optimized Blueprint Component Data" is enabled. The changes in ...
Pilot actor no longer generates undo transactions
UE - Editor - Jan 22, 2024The piloting feature in the editor viewport is not undoable with Ctrl+Z It also does not cause the actor to become dirty so any changes during piloting are lost and not saved (user also not prompted ...