Editor crash (unhandled assert) when changing blend mode on a material assigned to a Nanite static mesh

POST LINK: https://forums.unrealengine.com/t/editor-crash-unhandled-assert-when-changing-blend-mode-on-a-material-assigned-to-a-nanite-static-mesh/2764048

POST BODY:

• Summary
  Changing a material's Blend Mode crashes the editor when that material is currently assigned to a Nanite-enabled static mesh (visible in the level or in the Material Editor preview). The engine correctly logs a warning that the blend mode is unsupported on Nanite, but then proceeds into a Lumen scene card capture path that asserts instead of failing gracefully.

• What Type of Bug are you experiencing?
  AI

• Steps to Reproduce
  Create or use a static mesh with Nanite enabled.
  Assign a material to it (in the level, or set as the Material Editor's preview mesh).
  Open the material and change its Blend Mode.
  Editor crashes immediately.

• Expected Result
  Editor should not crash. Ideally it should block or gracefully reject the invalid blend mode/Nanite combination, consistent with the warning it already logs.

• Observed Result
  Editor crashes with an unhandled assertion.

• Affects Versions
  5.8

• Platform(s)
  Windows

• For crash reports, include your callstack
  LogStaticMesh: Warning: Invalid material [NewMaterial] used on Nanite static mesh [SM_Drone_Two_Mats].
  Only opaque or masked blend modes are currently supported, [BLEND_TranslucentColoredTransmittance] blend mode was specified.

LogWindows: Error: appError called: Assertion failed: Nanite::IsSupportedBlendMode(ShadingMaterial)

[[Link Removed]:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\Lumen\LumenSceneCardCapture.cpp] [Line: 312]