Unreal Engine Issues

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. ...

Selection of foliage instances broken with nanite

The selection of individual instances of a foliage HISM is broken, so that the instance is correctly outlined but the gizmo is placed over a different instance. If we delete the selected instance it ...

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 ...

Pose watches don't display correctly with compatible skeletons

"Hello, we've found a quirk with ABP's pose watch and compatible skeletons. Same setup as above. We have skeleton A as the base and skeleton B as a compatible skeleton. They both share similar hiera ...

The GetCombinedForces put out wrong value when the vehicle is reversing

Reproduced 3/3 times. A similar bug occurred with PhysX ([Link Removed]) Check the function:  FVector FSimpleAerodynamicsSim::GetCombinedForces(float VelocityIn) if the velocityIn is negative, th ...

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

Adding an Input Action to a Mapping Context causes the drop downs to expand and collapse randomly

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. ...