Unreal Engine Issues

Vector NotEqual / != displays default tolerance of "0" instead of "0.0001"

If this is just a display issue, it's still fairly significant because a tolerance of 0 and anything else are very different. I have not confirmed if it's only display or if the comparison is actual ...

Rect Light distribution incorrect with CPU Lightmass

Navmesh rebuild always occurs on Startup map immediately after starting editor

Whenever launching the UE5 Editor, it rebuilds the navmesh on the first map it opens. Reopening the same map again will not cause the navmesh to be rebuilt. It seems that the first time the map is o ...

NiagaraEmitter using Grid 3D Template of NiagaraFluid plugin at coordinates greater than about 10.5 km is not displayed

Hierarchical Instanced Static Mesh does not render correctly on Vulkan mobile

Something is rendering incorrectly about hierarchical instanced static meshes on vulkan mobile. If the project uses GPUScene, instead of using HISM for manual instancing, and relying on GPUScene for ...

GAS: RemoveReplicatedLooseGameplayTag on unadded tag causes it to be replicated

A UDN user found that calling AbilitySystemComponent->RemoveReplicatedLooseGameplayTag(TagToRemove); while the gameplay tag was not in the TagMap, will create an entry for it with count 0, see ...

Double-clicking metasound graph input widget resets value to 1, but displayed value does not change

Reproduced 3/3 times. Issue also occurs in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed NOT a Regression. ...

GAS and single process PIE: modifiable static variables accessed by server and client

See: UAbilitySystemGlobals::HandlePreLoadMap GAS features static variables that are modified by both server and client, thus result in issues in single process PIE where they access the same memory ...

Improper Initialization of trigger values when added at runtime with the key pressed already

See the comment on UInputTrigger::LastValue around issues being a bool type on first tick ...

FEnhancedActionKeyMapping struct has incorrect comparison results

The fix for this is to override the  FEnhancedActionKeyMapping::operator== to account for the deep copy that happens on modifiers instead of comparing addresses ...