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 ...

Editor hang calling UMoviePipelineBlueprintLibrary::UpdateJobShotListFromSequence

UE - Anim - Sequencer - MRQ - May 14, 2025

Within UMoviePipelineBlueprintLibrary::UpdateJobShotListFromSequence we are experiencing an editor freeze when launching an MRQ render of sequences where a camera is unable to find a valid possessab ...

Editor 'Build All Levels' discards Volumetrics Lightmaps in persistent level

UE - Graphics Features - May 14, 2025

Building the level or lightmaps can clear the volumetric lightmap. In 5.5, this requires you to perform a full build, or a lighting only build with a BSP brush in the scene. In 5.6, all level build ...

RigidBody parameters not working (external force and others)

UE - Simulation - Physics - Character - May 14, 2025

We are running into issues where the parameters of the RigidBody node in an ABP are not being applied at all when running the ABP in PIE even when the parameters are working correctly in the ABP pre ...

RayTracingManager::Tick() called twice in a single game frame

UE - Graphics Features - Ray Tracing - May 14, 2025

A licensee has shared a project with us, in which they are able to trigger a problematic case where the RayTracingGeometryManager is ticked twice during a single game frame. It would be good to inve ...