Unreal Engine Issues

Custom Primitive Data on BP instance not taking affect while in editor

Original Repo is from 4.27, however, it still happens in 5.2. This is happening because the Instance Data system does not update the field UPrimitiveComponent::CustomPrimitiveDataInternal from the d ...

Level Object value is lost when a new level is loaded using the same BP

First discovered this on Linux in //UE5/Main. In the repro, you play from level 2; if you opened Level 1 and played from there, the same outcome would occur. LogNet: Warning: Travel Failure: [Clien ...

Assets with Render in Main Pass disabled show shadow artifacts

This issue was originally reported specifically for Destructibles, but it appears to affect Skeletal Meshes, and static meshes when selected. When "Render in Main Pass" has been disabled skeletal an ...

[CrashReport] UE4Editor_Renderer!FUniformMeshConverter::Convert()

This is a regular crash that has occurred through 4.16 and into the 4.17 previews. The callstack is similar to [Link Removed] (invalid), although the error message is different. User Description ...

Crash on Mac on exit.

A licensee reported trouble with a crash on exit on Mac. They discovered that the file AvfMediaPlayer.cpp, on the function Open there is this piece of code:// Force the AV player to not be able to ...

FBX animations generated under fractional framerates fail to import

We now have the following error that is generated in FFbxImporter::ValidateAnimStackif (!FMath::IsNearlyZero(SubFrame, KINDA_SMALL_NUMBER) && !FMath::IsNearlyEqual(SubFrame, 1.0f, KINDA_SMALL_NUMBER ...

Crash Importing some assets with "Keep Overlapping Vertex"

Download offending asset here: [Link Removed] Error message: Assertion failed: NewPosition >= 0 [Link Removed] [Line: 452] Source Context: 438 virtual ~FFileHandleWindows() 439 ...

Build failure after nativizing any child Blueprint class with function override (regression).

Nativization regression in 4.20 preview 1. Cannot nativize overridden functions. Log Output:UATHelper: Packaging (Windows (64-bit)): D:/Projects/Unreal/NativizeMethod/Intermediate/Plugins/Nativized ...

IOS deviceCrash when input Korean Charactor on EditableTextBox

FAnimationRuntime::BlendPosesPerBoneFilter() causes an assertive crash when Skeletal Mesh LOD is changed

The crash occurs from "check(BoneBlendWeights.Num() == NumBones);" This crash occurs when the following conditions are met;The skeletal mesh LOD is changed.The number of bones is difference between ...