Unreal Engine Issues

Niagara Regression - Looping particle with Spawn Burst Instantaneous on time 0.0 flickers for a frame between loops

Note: This worked correctly up to UE 5.4, but repros from UE 5.5 up to mainline latest. If a Niagara Emitter is set up with "Spawn Burst Instantaneous" on time 0.0, and the spawned particle(s) have ...

Adding vertex color to a model that has morph targets, removes or invalidates the morph targets.

[AI] Automatically generated navlinks do not contain the poly flag for being a navlink.

Automatically generated navlinks are failing to be detected by FNavMeshNodeFlags::IsNavLink. The area flag assigned to the navlink end points is not including the NavLinkFlag. ...

Offset Root Bone Node needs reconstruction from velocities

The experimental Offset Root Bone node does not respect velocities, meaning that it does not work when a character is based on a moving platform. The capsule will rotate with the platform, but the r ...

In Sequencer Swap Root Bone Actor function couldn't keep animation state when finished

[Link Removed] ...

DistanceToNearestSurface node does not work when r.DistanceFieldAO is disabled

The problem seems to be that the bUsesGlobalDistanceField flag in the ShouldPrepareGlobalDistanceField() function checks for usage on the material, but it doesn't seem to take effect. The material u ...

Bake Pose is not applied correctly when using LODSettings asset

The Bake Pose setting does not work when using a SkeletalMesh LODSettings asset. After the change in CL22878911, the BasePose in the LODSettings asset is no longer copied to the BakePose in the skel ...

URuntimeVirtualTextureComponent::RequestPreload not working for some edge cases

A licensee has reached out to us to inform us that the logic for preloading at times fails to account for adaptive virtual textures when the requested mip level is not in the shared AllocatedVirtual ...

Drag-and-drop any cooked Blueprint class asset into the level viewport crashes the editor

Dragging any cooked Actor-based Blueprint class asset into the level editor viewport will crash the editor when it has been configured to work with cooked assets. This is a regression that started ...

Interchange framework is bypassed on the second attempt after a failed import

Hello! We have encountered a bug with the Interchange pipeline. When an interchange texture import is cancelled due to non-power of 2, and then the same texture is imported again without any change ...