Unreal Engine Issues

Crash when exporting static mesh actor to FBX (Array index out of bounds)

I set the Forced LOD Model on the mesh component > 1, then tried to export, this is what causes the crash. Here is my suggested fix, we just don't use Git or I'd do a PR: In the else() branch of FF ...

Calling UMoverComponent::IsModifierActiveOrQueued() immediately after calling UMoverComponent::K2_QueueMovementModifier() will return false

Calling UMoverComponent::IsModifierActiveOrQueued() immediately after calling UMoverComponent::K2_QueueMovementModifier() will return false. Checking the code, IsModifierActiveOrQueue() calls FindMo ...

Float Curve evaluation may yield completely wrong results due to floating-point precision issue

Note: This is possibly related to [Link Removed]. For some inputs, function UE::Curves::WeightedEvalForTwoKeys() inside file "CurveEvaluation.cpp" can incorrectly return the value of the first key, ...

Deadlock running anim modifiers that affect bone tracks on multiple sequences

Running anim modifiers that affect bone tracks can deadlock the editor when applied to multiple anim sequences. ...

Nanite Landscape crash on save

UDN description:When landscape is flagged as Nanite enabled but nanite mesh has not been built yet, a save operation (or an auto save) triggers a fatal failed check in ULandscapeNaniteComponent::Ini ...

FX.TestGPUSort fails on Vulkan

“FX.TestGPUSort” fails on both PC Editor and Android with Vulkan RHI. ...

Crash in AWorldDataLayers::InitializeDataLayerRuntimeStates() when quickly unloading then loading a sub-world partition

From licensee: Since we integrated 5.5, we are experiencing a crash in AWorldDataLayers::InitializeDataLayerRuntimeStates() on this line check(ActiveDataLayerNames.IsEmpty() && LoadedDataLayerN ...

Mesh particles are inadvertently culled when NiagaraActor scales large

When a large scale value (e.g. 500) is set on the NiagaraActor, the mesh particle is unexpectedly hidden. This may be a side effect of the following change ([Link Removed]). PrimitiveData.NonUnifo ...

ReflectionCaptures as ChildActorComponents does not capture and reload the MapBuildData Correctly.

Engine no longer compiles after backporting RHI thread improvements and crash fix

Unreal Engine 5.4 code will no longer compile after applying both the RHI improvement code changes as described in [Link Removed] and the fix for the crash described in [Link Removed]. The compilati ...