Unreal Engine Issues and Bug Tracker (UE-116051)

Steps to Reproduce

New a blueprint asset and add a spline mesh component assigned with any static mesh asset.
Place the blueprint actor in a level with raytracing option in project settings enabled and "cast ray tracing shadow" enabled in light.
We could see the spline mesh component does not cast shadow at all.

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-116051 in the post.

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By Design

Component	UE - Graphics Features - Lumen

Main Commit	23949217
Release Commit	23951916

Spline mesh can not cast shadow when raytracing enabled.