Unreal Engine Issues
Unreal Engine Issues
Applied external forces to vehicles may be nullified by sleeping
UE - Runtime - Simulation - Jan 12, 2024If Entering sleeping state and applying external force are same time, the external force is nullified and the vehicle stops immediately. p.Chaos.Solver.SleepEnabled 0 or __ setting SleepLinearVel ...
Implied Decal Blend Modes don't account for static ignore-switch parameters in an expected way
UE - Rendering - Architecture - Sep 28, 2021The desired behavior from a user perspective here is that they'd be able to use Static Switches in a decal master material to toggle different features and behaviors. In the above setup, if I set th ...
Getting Vector Parameter Values from a Dynamic Material Instance with 1 or more vector parameters returns an empty array
UE - Rendering - Architecture - Materials - Jan 3, 2023This is not a regression. Tested in //UE5/Release-5.0 CL20979098 The array for Vector Parameters isn't getting populated when called from a Dynamic Material Instance. ...
StartPlayInEditorGameInstance doesn't consider bStartInSpectatorMode for client instances
UE - Networking - Nov 15, 2022In UGameInstance::StartPlayInEditorGameInstance, the server instance will go through the normal process of creating the URL using BuildPlayWorldURL, which checks the FGameInstancePIEParameters' bSta ...
Unable to play replays with custom GameNetworkProtocolVersion set at runtime
UE - Networking - Sep 20, 2023It seems that when comparing the custom versions for a replay (in the "operator<<" defined in ReplayTypes.cpp), the value retrieved from the FCurrentCustomVersions is not the value set at runtime, b ...
Logging out and then logging in as a new user results in slate creating multiple Slate User IDs
UE - Gameplay - Input - Jul 28, 2023I believe this is happening because when you change your logged in user, the Slate Application will automatically create a new second slate user with an ID of 2. This is bad because the Slate App is ...
Lumen Reflections in Stereo are broken after Nvidia GPU Driver Update
UE - Platform - XR - Jul 29, 2024After updating the NVidia graphics driver to v.552.74+, reflective/mirror materials appear broken and render with black and white lines in VR mode if they are in a level with a Post Process Volume w ...
Iris - Server fails to send client initialization RPCs after seamless travel if the client finishes travelling first
UE - Networking - Iris - Nov 18, 2025During seamless travel, when a client loads into the destination level it will call APlayerController::ServerNotifyLoadedWorld, including when it finishes the travel before the server. When the serv ...
Object Mixer shows actors the World Outliner hides (5.8 is incompatible with 5.7-and-earlier behavior)
UE - CAPT - Tools - Aug 25, 2026For the same project and the same filter, Object Mixer returns a different set of actors on 5.8 than it does on 5.7. Actors that the World Outliner hides now appear in the Object Mixer list. Editor ...
Does FSlateElementBatcher::AddCachedElements need to check if r.HDR.UI.CompositeMode is enabled?
UE - AI Workflows - UI Systems - Aug 28, 2024When a specific configuration of HDR cvars are set, PIE in a New Editor Window will not render the game world. Settings (For DefaultEngine.ini): ```[SystemSettings] r.AllowHDR=1 r.HDR.Display.Color ...