So there seems to be a problem with linetrace missing small geometry. The smaller the component, the more likely it is to be missed from random angles. Is that a known problem, and are there any known solutions for getting accurate geometry hits?
Does checking the “Always include tangents” setting on the tileset help with your issue?
A similar problem has been observed previously and a fix for it will be included in the next release - Fix UE5 Line Tracing bug by joseph-kaile · Pull Request #947 · CesiumGS/cesium-unreal · GitHub
If this does not resolve your issue, please let me know.
-Alex