Can't See Universal on other Materials Ingame

[EndorsedModel]

If I recall correctly this is because you are using materials and materials will hide surfaces other than smooth or something similar to that.

EDIT: Here’s an official reply by zeuxcg

Inconsistency between studio + play solo rendering of surfaces with materials

This is by design. The surface display is only happening in Edit mode to let you know how welding behaves. It’s disabled in Play Solo and actual player.