Unreal Engine Issues
Unreal Engine Issues
FInstancedStruct does not serialise to JSON when used in a DataTable
UE - AI - Aug 4, 2025The JSON export functionality for DataTable relies on a FieldIterator to gather properties. This iterator is unable to gather the properties from the InstancedStruct. CSV export functionality works ...
Crash in IndirectLightingCache on level load
UE - Graphics Features - Aug 11, 2016May be a duplicate of this bug, which was closed due to no repro:https://jira.ol.epicgames.net/browse/UE-10978 ...
FAES::DecryptData does not decrypt the supplied input.
UE - Foundation - Core - Jun 22, 2016Something that has been encrypted with the FAES::EncryptData() function does not return to the original input when decrypted with FAES::DecryptData(). ...
Blueprint Implementable Events and Event dispatchers with the same name break the event dispatcher.
UE - Gameplay - Blueprint - Sep 22, 2015Creating an event dispatcher and BlueprintImplementableEvent function with the same names causes a signature conflict inside the blueprint. The event dispatcher is then broken as it cannot be delet ...
Lightmass export can fail with duplicated static mesh assets
UE - Graphics Features - Aug 30, 2017See https://answers.unrealengine.com/questions/853450/417-lighting-build-fails.html ...
Keep Simulation Changes Applies to Incorrect Actor with Sublevels
UE - Editor - Jun 21, 2023When setting properties and saving simulation changes, EditorUtilities::GetEditorWorldCounterpartActor and EditorUtilities:GetSimWorldCounterpartActor functions seem to get the wrong actor. Actors i ...
GeometryScript: BlueprintCallable GetMaxMaterialID return pin is incorrectly named "Enabled" instead of "MaxID"
UE - Graphics Tools - Modeling Tools - GeometryScripting - May 2, 2025The return pin for the "Get Max Material ID" function is incorrectly named "Enabled" when the function returns the MaxID. See \Engine\Plugins\Runtime\GeometryScripting\Source\GeometryScriptingCore\ ...
Code review for potential fix for crash where Velocity contains NaN
UE - Gameplay - Aug 20, 2015User crashed in the function "void UCharacterMovementComponent::PerformMovement(float DeltaSeconds)" due to a Velocity containing NaN. AnswerHub post details function calls that lead to where the N ...
Unable to Open Level in HTML5
UE - Platform - Mobile - Mar 16, 2016Trying to use an Open Level function in HTML5 does not allow the level to actually load. Instead, the project flashes and refreshes back to its original position. Open Level function does work on W ...
Pixelated volumetric translucent shadows
UE - Rendering - Features - Aug 17, 2021I narrowed down the issue to the Main call of ShadowProjectionPixelShader, and tested (on 4.26 and 4.27) a combo of different material and light shadow settings, as well as enabling transmission on ...