Unreal Engine Issues

4.23 UpdateGrass took twice time than 4.22

NavModifierVolume's FailsafeExtent is applied to the wrong area

The FailsafeArea of NavModifierVolume is generated at a different location from the center of the actor when it rotated. This means that the effect of rotation is incorrect. (see attached file) W ...

Memory leaks at changing lighting scenarios

The engine does not free the LevelRenderAssetManagers array elements in FRenderAssetStreamingManager when changing lighting scenarios. Following code can avoid this issue. void FRenderAssetStre ...

If Material is not overridden, Material will not be exported correctly.

This is because FFbxExporter::ExportStaticMeshToFbx() does not correctly determine the OverrideMaterials.  Therefore, the following code will not pass.else { Material = StaticMesh->GetMaterial(P ...

MipLevel sample mode doesn't work as expected in Adaptive RVT

When StaticMeshComponent is added to an empty Actor, no HLOD is generated.

When a Cube of StaticMeshActor is placed, it is generated without any problem. ...

Media Plate Actor becomes blacked out when set to Spawnable in a Level Sequencer

saving a media plate actor set to spawnable in a level sequence causes the media plate actor to become black. there are two known workarounds 1. toggling the Media plate to Possessable, and Spawnabl ...

Nanite static mesh is still visible even if "Render in main pass" or "Render in depth pass" is used

Enabling SunPosition engine plugin causes a missing file warning in a packaged build

Licensee noted that editor-only code from the Sun Position Calculator engine plugin was causing a warning in packaged builds. A similar issue was reported for 4.22 [Link Removed], but this appears t ...

FStaticMeshCompiler::FinishCompilation stalls when compiling multiple meshes.

Calling "FStaticMeshCompiler::FinishCompilation" on multiple assets simultaneously can cause a hang. Also tested on //UE5/Release-5.5, CL: 36784631 ...