For reference: If a geo contains primitives containing polygons other than triangles or quads, for example, a tube in Houdini with End Caps enabled, the end caps will be without tessellation, making cap primitives contain more than 3 or 4 vertices.
The easiest fix would be to download game dev tools and use a SOP called quadrangulate which will triangulate your geometry appropriately. Internally quadrangulate SOP is using SOPS like Dissolve & PolyFill but is a convenient HDA to use which will also take care of UV’s.