Unreal Engine Issues

MemReport does not seem to respect mesh streaming

The function "FStaticMeshLODResources::GetResourceSizeEx(...)" does not take into account that the buffers might be emptied, due to Mesh Streaming. This causes "obj list" to report sizes larger than ...

[AI] Area Class to Replace does not work on SplineNavModifierComponent

The SplineNavModifierComponent does not have the same behavior as regular nav modifier components where the modifier can specify that it only replaces a given NavArea class. Setting the area class t ...

Using blueprint debug step into BlueprintInterface function, occur crash.

If StepIn is performed on a module for which the Interface function is not defined, a crash will occur. ...

Crash when using StaticDuplicateObject with mismathced Source and Destination class types

Starting in Unreal Engine 5.4, StaticDuplicateObject internally switched to using Unversioned Property Serialization (UPS) for performance reasons. However, UPS assumes the source and destination ob ...

HLOD crash when dragging and dropping actors into their own cluster in the HLOD outliner - ALODActor

Enabling Anisotropic BRDF causes crash upon Editor restart

Enabling the Anisotropic BRDF (beta) causes crash upon restarting the Editor. This was reported and tested in 4.25 Preview 2 (CL-12055273). This was reproduced in main 4.26 (CL-12161634). ...

Warp Utils plugin crashes on Editor restart

Enabling the Warp Utils plugin and restarting the Editor causes it to crash. This is a regression from 4.24.3 (CL-11590370). This was reported and tested in 4.25 Preview 2 (CL-12055273) and reprodu ...

D3D HUNG crash - FD3D11DynamicRHI::RHIReadSurfaceFloatData()

This is one of the widespread D3D Hung crashes that have existed since 4.14. This particular callstack has affected around 300 users. The issue has been successfully reproduced on a home PC. Dxdi ...

Text block Outline cropped out at large sizes

Text block Outline cropped out at large sizes. This affects Grid Panels and was additionally tested with Horizontal boxes with the same result Regression: This issue does not occur in 4.14.3 Binary ...

Per-section shadow/collision flags lost when merging actors

Information loss when merging actors such as cast shadow and collision. If one of the actors being merged has a different setting such as not casting shadows. This information will be lost and repla ...