Unreal Engine Issues

Crash at compile time when using a VariableSet node with a local variable created by pasting a private property

When a property is created in this way, a local variable with a Private flag is generated. Since such a variable is generally not desirable, it would be better to remove the Private flag upon pastin ...

All Megascan asset libraries are missing

All Megascans assets no longer appear in Twinmotion 2025.2 hotfix (46767548). Other libraries do not appear to be affected. ...

Setting a struct bool property (bitfield) to itself writes the wrong value

There's an issue when assigning a bitfield bool to a native bool in Blueprints. Currently, the engine erroneously treats the memory for a local bool as a uint8 bitfield, which is undefined behavior. ...

Niagara Fluids Plugin creates a memory reference of any saved level by only being active, before being actually used.

While Niagara Fluids Plugin is active it creates a memory reference of any saved level regardless of being actually used. Simply enabling the plugin shows a memory reference while deleting the level ...

The Geometry Collection Dataflow node CreateGeometryCollectionFromSources is breaking Material Assignment

The Geometry Collection Dataflow node CreateGeometryCollectionFromSources is breaking Material Assignment. As the licensee has pointed out, this previously worked in 5.5. The most probably cause fo ...

Windows Game Input - DualSense/DualShock controllers DPad button repeat events behave unexpectedly

Failed to generate Nanite data for mesh with bDoFastBuild enabled

If "bDoFastBuild" is enabled on a Static Mesh asset, in-editor it will never be able to have Nanite data built for it, preventing the Static Mesh from using Nanite. There is no way to fix this issu ...

All public inline methods of class "FBlueprintEditor" are inaccessible to other modules due to "DLLIMPORT"

Class "FBlueprintEditor" has several inline getter methods as part of its public API (e.g. GetPreviewActor() and GetPreviewScene()). However, even though they are public, those methods are inaccessi ...

Many downloaded cloud items cause a performance issue when booting Twinmotion

See slack thread: [Link Removed] Resume : In the context of the object substitution for Revit, when TM starts, it exports a csv listing the available objects and their corresponding thumbnail. This ...

SetActorLabel() is slow on Landscapes

I've noticed calling SetActorLabel() on a Landscape will call PostEditPropertyChanged() which causes the Landscape Components to regenerate all collisions. As per the repro, this can take a long tim ...