Unreal Engine Issues

Widget defaults not updated when modified on a base widget class via the hierarchy

A licensee has reported an inconsistency in how modified base widget class defaults are propagated to children. When modified via the UMG Designer Graph's Class Defaults, derived classes will be mar ...

Actor corruption due to Hierarchy broken after load

We recently hit a situation where some actors would suddenly teleport across the map when they were modified in the editor. We figured out that the AttachParent of some actors got reset on editor l ...

iOS ReplayKit isn't working in UE5.1+

In 4.27 & 5.0 when you press the in-app screen recorder button it would pop-up a msg about the user giving permission to allow the screen recording and then would start the recorder and save the mov ...

Pending Abilities are always Added then Removed (thus ordering is not preserved)

We should probably keep a Queue of the Gameplay Abilities Add/Removed rather than two separate lists.  That way we can get the ordering right.  I suspect there are lots of ordering issues if we look ...

Allow extending World Partition streaming partition class

Editor becomes unresponsive/freezes when a Geometry Collection is destroyed by a Hit Event while simulating

This is a regression. Tested in //UE5/Release-5.1 CL23901901 When a geometry collection is destroyed by an On Hit event the editor becomes unresponsive and never recovers. No crash is generated. ...

Lumen tile classification flicker

While we suggest using screenpercentage at 25%, it is visible at higher percentages. Video showing the flickering:https://udn.unrealengine.com/s/contentdocument/0694z00000Qw4jPAAR ...

MaterialBaking LocalSpace Issue

See attached project for a good repro ...

Level Instancing and Is Editor Only Actor flag

WP handles PIE Editor only properly (doesn't load the actors at all) but the old level streaming system just hides them through the FPrimitiveSceneProxy. So in this instance, the bug is that the Lev ...

Cooking crash during shutdown with no useful error

Sometimes some of actors are destroyed after the destruction of the solver through the garbage collector. In this case, the app crash in FChaosScene::RemoveActorFromAccelerationStructureImp because ...