AnimNotify Issue with LevelSequencer Actor with URO

UE - Anim - Runtime - Anim Blueprints - May 19, 2025

Sometimes AnimNotify does not fire when an animation is executed under the following conditions. 1. The CharacterMesh's AnimationMode uses UseAnimationAsset 2. CharacterMesh's URO is enabled (Enable ...

Tick functions are skipped on the first frame in package build and standalone PIE

UE - Gameplay - May 19, 2025

It's reported that all Tick functions are skipped on the first frame when running in packaged builds and standalone PIE. This is because both TickVisitedGFrameCounter and GFrameCounter are initializ ...

[AI] SmartObjectSlot does not have a valid node ref even when it should project to navigation.

UE - AI - SmartObject - May 17, 2025

If you request a SmartObject slot entrance location and require it to be navigable, it will return a result that does not include the node ref of the nav poly for the entrance to the slot. Instead i ...

Editing values of a control rig can cause the undo to stop working in Anim Details or Sequencer

UE - Anim - Sequencer - May 16, 2025

It has been observed that the the undo function may stop working after the User changes values of a control rig with the slider in the Sequencer. While using the slider, the value stops chaning afte ...

Cash when entering Path Tracing view mode if r.Decal.NormalReprojectionEnabled true

UE - Graphics Features - Path Tracer - May 16, 2025

Cash when entering Path Tracing view mode if r.Decal.NormalReprojectionEnabled true The licensee has reported: This crash happens because the DeferredShadingRenderer tries to extract the normal GBu ...

Changes to Instanced Properties default value on BP not propagated to placed actors in the opened level

UE - Foundation - May 15, 2025

In UE versions 5.4 and onwards (as of CL 42589677 in Main), when an Instanced UObject property is defined in an Actor Blueprint, modifying the default value in the Blueprint does not propagate the c ...

Bone names of ~100 characters or longer crash the editor when baking to control rig

UE - Anim - Rigging - Control Rig - May 15, 2025

This is an issue with inconsistencies over rig names and how control names are generated. We expect that a control name will be appended with _CONTROL or _CURVE_CONTROL. But because URigHierarchy: ...

Bug in CurveLinearColor makes colors of Diffraction material white outside curve range, causing rendering artifacts

UE - Texture - May 14, 2025

There seems to be a regression with linear textures (commonly for multi-channel masked textures) in UE5.4. Setting the "Encoding Override" (under Texture > Advanced > Source Color Settings) to "Line ...

Sequence with restore state set is causing a "Fatal world leaks detected" crash

UE - Anim - Sequencer - May 14, 2025

We recently had a few occurrences of crashes caused by a "Fatal world leaks detected" error when unloading a level (in a packaged game and in editor). I tracked down what was keeping a references t ...