Rendering Bug: Foliage instances flickering black after v40.30 update

Summary

Since a recent update to UEFN and Fortnite, all my foliage elements (especially rocks) exhibit a significant black flicker in the viewport and in-game. This issue is specific to elements placed in Vegetation mode.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

Open UEFN on PC.

Select the Foliage tool.

Add a custom Static Mesh to the foliage palette.

Paint the rocks onto the landscape.

Observe the rocks in the viewport or launch a game session.

Expected Result

The rocks placed with the Foliage tool should render correctly and smoothly, exactly like a single Static Mesh placed manually in the scene.

Observed Result

The foliage instances violently flicker and flash black. Important note: The exact same Static Mesh renders perfectly without any bugs when placed individually; the black flickering ONLY occurs when it is painted as Instanced Foliage.

Platform(s)

PC

Island Code

8445-7448-0769

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Video

Wow this is immersion breaking