Unreal Engine Issues

Refraction does not pass through Material Function node Correctly

MaterialInstanceConstant doesn't refresh soft references of non-overridden texture parameter

Observed by a licensee: [Link Removed] When a material instance points to a material, and the material is edited to change a texture and the material and material instance are saved, the material i ...

PNG file import does not read R values correctly

Looking at each value of the texture, it seems that the import of the R value is incorrect. PNG:[Link Removed] TGA:[Link Removed] ...

Motion Matching - PoseSearchDatabaseAsyncCacheTask::CreateKey is nondeterministic

This is caused by use of MakeMemoryView on arrays of structures in PoseSearchFeatureChannels.cpp. Need a proper serialization path for hash key gen here. ...

CompileAllBlueprints crashing on blueprint function with a delegate input.

In some scenarios, FPropertyDelegate::SignatureFunction can point to freed memory after a garbage collection run. This appears to be more common when running the CompileAllBlueprints commandlet. ...

Gameplay ability blueprints cannot be debugged in multiplayer

The object filter in the blueprint debugger can be used to filter breakpoints to a specific instance of an object. This is important for multiplayer because there will be multiple versions of the sa ...

Material fails to compile when virtual texture is connected to opacity mask only through Set/Get Material Attributes

If we connect a virtual texture to the opacity mask output of a material the material will fail to compile. This is expected. However if the opacity mask uses a regular texture connected via SetMat ...

Spectral Analysis Delegates Do Not Behave As Expected If 3 Or More Are Attached To The Same Submix

When attaching 3 or more Spectral Analysis Delegates to the same Submix, some delegates start returning only zero values. If this is a known limitation of Spectral Analysis Delegates, we should prob ...

Niagara Geometry Cache Renderer does not update index binding in looping emitter

Crash occurs while replacing a Widget Component with a user created Text Block

This is not a regression. Tested in //UE4/Release-4.27 CL18319896. The crash occurred. Crash occurs while replacing a Widget Component with a user created Text Block blueprint. ...