Unreal Engine Issues

Editor crashes when Material Layer visibility is toggled after removing a Material Layer in Parent

When a Material Layer is removed from a Parent Material, the Parent Material updates correctly in the viewport, but any Child Material Instance do not update correctly in the viewport until the Chil ...

Adding/Removing a Material Layer on a Parent Material doesn't propagate to Children correctly

When a Material Layer is added to or removed from a Parent Material the layer changes don’t automatically propagate to Child Materials correctly even if the Parent Material is saved. The Child mate ...

MRG - Potential issue with graphs being duplicated in game builds

Audi has [Link Removed] saying they cannot duplicate graphs in a game build. They are off launcher, not a custom build. Slack thread [Link Removed] ________________________________________________ ...

Non-determinism when cooking a UProceduralMeshComponent

We received a report from a licensee that UProceduralMeshComponent cook is not deterministic. This is related to the ProcMeshBodySetup member and the fact the UProceduralMeshComponent code changes t ...

Material parameters flickering due to UMG animation switching and multi-threaded execution

When continuously transitioning to UMG animations that have a track targeting the same material parameter within the UUserWidget::OnAnimationFinished event, the number of source inputs to UMovieScen ...

Replication Graph - Reliable multicast RPC may be dropped for actor recently set to dormant

The replication graph will wait until the client acks the close bunch and the actor channel is cleaned up to remove the channel from the ActorInfoMap (see UNetReplicationGraphConnection::NotifyActor ...

Level Instance Property Override: Actor::Tags overridden pre-CS but clobbered by RerunConstructionScripts with no post-CS re-apply

Summary When using the Level Instance Property Override system, overrides applied to `AActor::Tags` are silently lost for Blueprint actors whose Construction Script assigns or appends to `Tags`. The ...

Double to float conversions of time in renderer causes precision issues

In game sessions when the value for world time becomes large enough we start running into floating point precision issues. These issues can easily be seen in materials which do periodic animation b ...

Geometry collection : Should allow newly broken pieces to go through their own collision detection and constraint solve before the next iteration

WorldPartitionChangelistValidator incorrectly flags actors referencing the level script actor as invalid

When validating a change list that contains an actor that references the level script in the world (e.g. it has an event bound on the level script graph) it will fail changelist validation 100% of t ...