A spline component will become invisible after building geometry with the spline actor in the level.
This issue is occurring in //UE5/Release-5.1 @ Binary CL 23058290
This issue is NOT occurring in //UE5/Release-5.0 @ Binary CL 20979098
Marked as Regression
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-174798 in the post.