GetStaticMeshViewport() is called without checking if it returns a valid viewport causing the Editor to crash

UE - Editor - Dec 9, 2021

This is not a regression. Tested in: //UE4/Release-4.27 CL18319896 Binary //UE5/Release-5.0-EarlyAccess CL16682836 Binary //UE5/Release-5.0 CL18407655 Personal P4 When opening a static mesh without ...

udatasmith runtime import does not work properly

UE - Editor - Content Pipeline - Datasmith - Importer - Dec 9, 2021

The udatasmith is created through the unofficial blender exporter that seems to still be using SDK 4.24E0 ...

Reflection result of clear coat bottom normal is not correct.

UE - Rendering Architecture - Materials - Dec 9, 2021

This problem tends to appear in the southern hemisphere of spherical objects. It is not reproduced in 4.19. ...

Incorrect number of vertices displayed by ProfileGPU command in Cascade particles

UE - Niagara - Dec 9, 2021

This issue was reported by the licensee, but it's possible that the number of vertices in the particles is higher than it really is. ...

Project crashes in split screen when entering water body lake

UE - Graphics Tools - Terrain - Water - Dec 8, 2021

When creating a landscape with a waterbody lake. The engine will crash when in split screen when the player enters the water. This is not regression, it is occurring in 4.26. ...

AttachChildren can be incorrect on client if parent and attached actors are spawned at the same time on the server

UE - Networking - Dec 8, 2021

See linked UDN for more info. It seems as though if both a parent actor and its attached actors are created at the same time on the server, then there is a chance the attached actors won't appear at ...

Using the Transform Tool to manipulate multiple Event Trigger keys at different times in the Sequencer Curve graph sometimes causes crash

UE - Anim - Sequencer - Dec 8, 2021

This is not a regression. I was able to reproduce the crash in 4.26. Using the transform tool to manipulate keys for an Event Trigger within the curve editor of sequencer sometimes causes it to cra ...

Crash occurs while animating a control rigged actor in sequencer when drag selecting the actor in a orthographic view

UE - Anim - Sequencer - Dec 8, 2021

This is a regression Tested in 4.27.2 Drag selecting a control rigged actor while in an orthographic view causes the editor to crash. ...

Water line misaligned if Screen Percentage is less than 100% while Temporal Upsampling is enabled

UE - Graphics Features - Dec 7, 2021

Water line is misaligned if screen percentage is less than 100% while Temporal Upsampling is enabled. ...

Double clicking the thumbnail for a TSoftObjectPtr to a UWorld will load the level without prompting the user to save

UE - Editor - Dec 6, 2021

Currently, double clicking on a thumbnail for a SoftObjectPtr to a UWorld will load that level in the level editor without checking if the current world is dirty or prompting to save. This can resul ...