Unreal Engine Issues

UE 5.4 - Specular/reflection disappears above 4096 resolution render

After a viewport is more than 4096 pixels wide, Lumen's specular reflections buffer cuts its width off at 4096 pixels. It appears that the affected buffer is "Lumen.Reflections.ResolvedSpecularIndi ...

Pressing the "Show Inactive" button in the material instance editor did not display groups that did not contain the active parameter

When pressing the "Show Inactive" button in the material instance editor, all material parameters are supposed to be displayed in the EditorUI. This is not the case, only some of the parameters are ...

Logic error in TRange::Difference causes crash when you Trim and Preserve Left/Right and unbounded Attach section in the sequencer

TRange::Difference function does not handle bounds correctly, causes crash in the sequencer when "Trim And Preserve Left/Right" is used in the user's example project. User provided a potential fix: ...

Sequencer - Soft References do not work as payloads in Event Track keys, the endpoint event receives none/empty instead

In sequencer, an "event track" can be added to call functions/events defined in the Sequence Director Blueprint. The parameters for those endpoint functions/events can be sent as a Payload associate ...

Levels can get stuck in the 'loading' state when using Incremental GC

From licensee:"Testing incremental GC on our project we have ran into an issue with level streaming where levels will get stuck in the 'loading' state in packaged builds. The issue appears to be due ...

Client disconnect during seamless travel results in incorrect NumPlayers and NumTravellingPlayers

This issue seems to stem from HasClientLoadedCurrentWorld returning true in AGameMode::RemovePlayerControllerFromPlayerCount. When removing a player controller, the GameMode checks if a seamless tra ...

Foliage breaking when used Sublevels into a Persistent Level

Duplicating an imported socket wrongly displays the duplicate as also imported

The duplication of an imported mesh wrongly marks it as also imported from the source mesh. The probable cause is data duplication without taking this edge case into account. I suggest checking Unr ...

Landscape Import is per-region and does not calculate normals along the borders

Seams are found after importing a tiled landscape. ...

Landscape.Nanite.MaxSimultaneousMultithreadBuilds hangs indefinitely

It's possible for NaniteStaticMeshesInFlight to never be decremented because all the background workers are waiting indefinitely for the ones in flight to complete their static mesh build.  ...