Unreal Engine Issues

LWC Function Usage View Mode shows unchanging results for Nanite meshes with different LWC usage

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Crash when a Deferred Decal (Translucent) base material has a Nanite Override (Masked Surface) Material and the mesh has Nanite + Ray Tracing enabled.

A crash occurs when Nanite override material instance is used in a project with Ray tracing enabled where: 1 The Material assigned to the static mesh uses Deferred Decal / Translucent and the Nani ...

Rect Light not rendered correctly when using Virtual Texture as source texture

Licensees have reported that this issue occurs when rendering from the command line: Rectangular lights with virtual textures do not render when you run the "Render (Remote)" button in the Editor, a ...

Niagara Data Interface "Errors and Warning" section on Module Details not updating when error messages change

This is a regression: it worked correctly up to UE 5.5, but not in 5.6 or mainline latest. Possibly caused by CL 40093049. Class UNiagaraDataInterface provides virtual method GetFeedback(), which a ...

bIncludeComponentLocationIntoBounds breaks bounds calculations

Bounds generation when bIncludeComponentLocationIntoBounds is active is broken. Both the calculation of the local bounds and the world bounds are incorrect (see screenshot). When that flag is acti ...

Lumen Card Sharing is active on material with custom primitive data

The wrong emissive value may be used on Nanite objects with custom primitive data when Lumen card sharing is enabled. This issue can be mitigated with: r.LumenScene.SurfaceCache.AllowCardSharing 0 ...

Weight blended layers can leave ghost traces when cleared

Directory placeholders can get added to the external actor packages.

We should not create placeholders when using WP or OFPA. ...

Vector VM - Crash / memory stomp when using > 255 external function calls

The Vector VM has only every supported a byte's worth of external function calls, when we blew the limit it would index into the incorrect VM call. The new VM will also overwrite memory when exceed ...

Large RAM usage increase when loading some legacy scenes in 2025.2

Steps to reproduce:Open TM 2025.1Open the Salt Flats Note down the RAM usageSave the sceneOpen the same scene with the beta 3Note down the RAM usage. Compare results Expected results: The RAM Usag ...