Unreal Engine Issues

[AI] Navmesh tiles on different layers get removed while streaming out in WP Dynamic Modifiers Only navmesh

 Streaming out the navmesh and streaming the area back into the world before the GC runs causes the navmesh streamed back into the world to only have navmesh tiles on a layer with tiles that would b ...

MP4 file causing export hang

There is something specific to this MP4 file that prevents media from being exported. When it is included in a project file, Twinmotion sticks on 'Estimated time left computing' on export and must b ...

Crash while drag and drop 'Roll Holder L6Y' asset on viewport

Material Emissive Color not working with SkyAtmosphereIlluminance Material Expression

A licensee has reported that they are unable to use an emissive material utilizing the SkyAtmosphereLightIlluminance material expression together with Nanite and Lumen. The linked UDN has some more ...

Two-sided geometry cannot be enabled for re-imported models when converting from previous versions

When converting files from previous versions of Twinmotion to Twinmotion 2025.1, re-importing any existing imported geometry will cause the geometry to be re-imported with two-sided geometry disable ...

Overridden mesh values are lost when upgrading from 5.5.0/5.5.1 to 5.5.2 on blueprint skeletal mesh components

This issue is caused by the backout in 38341618.  The original code that went into 5.0 affects serialization by changing the UCS modified properties.  When upgrading, the override is lost because th ...

Improper clipping in children of a retainer widget

Children of retainer widgets have improper clipping, causing any widgets set to "Clip to Bounds" to clip incorrectly. This may also affect hit testing in cases where multiple retainer widgets are ne ...

Adding SmartObjectZoneAnnotationComponent to a blueprint actor causes a crash when building the package

If placing an actor with SmartObjectZoneAnnotationComponent added to blueprint actor in a level, it will crash when the level open. As a workaround, adding SmartObjectZoneAnnotationComponent to the ...

Bindless Textures do not mip stream as expected

Bindless textures do not appear to stream mip levels. This issue is separate from an already reported bindless virtual texture streaming issue. When the editor is freshly launched or when mip level ...

Regression: Cannot import Landscape Layer Weightmap along with Heightmap because of broken resolution check for tiled images.

When working in the "Landscape" editor mode, in both the "New" and "Import" tools, it is possible to import a single heightmap, as well as a weightmap for each layer. Each of these maps can come fro ...