Unreal Engine Issues

Metasounds - Using the Audio Component Play Node with a start timer other than 0 results in the Metasound ceasing to function

Metasounds cease functionality if called to Play with a different start time other than 0. This extends to the Metasound editor where pressing play to preview the sound also ceases to function. ...

Linear Color Struct values are changed when upgrading from 4.26.2 to 4.27.1

It seems that changing the value to something different than the default of a Linear Color Struct variable, results in the value being changed when upgrading the project to a new engine version. Thi ...

Ray traced reflections skewed with un-combined meshes

The showdebug abilitysystem command crashes editor when the target is a child actor

An actor with an AbilitySystemComponent that is spawned by a ChildActorComponent will have a null AbilityActorInfo. This leads to a crash in the ASC when GetDebugTarget attempts to access AbilityAct ...

Incorrect relative location on client under certain attachment conditions

An attached actor's relative location isn't correct on the client when the actor has its position changed to that of the parent actor before attaching with the "Keep World" location rule. On the cli ...

Path Tracing denoiser is not stable in animation

When rendering an animation with the path tracer through MovieRenderQueue, at low sampling rates the denoiser produces splotchy results that flicker from frame to frame. The current denoiser (Ope ...

Path Tracing - HDRIBackdrop contributing twice

The setup for HDRIBackdrop leads to double-counting of the illumination between the skydome and the geometry in the path tracer. ...

Steam Sessions fails to create when using the Create Session node

This is a Regression. 4.26.2 - Binary - no issue creating a session. 4.27.1 - Binary - no issue creating a session if you convert a previously working 4.26.2 project. 4.27.1 - Binary - Fails to c ...

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

Multiple Blueprint compilation passes required to fix up event binding to dispatcher after event rename

Renaming a custom event bound to an event dispatcher via a Create Event node requires two compilation passes to fix up the binding.  upd. Regression was checked on //UE4/Release-4.26 CL 15973114, i ...