toJsonSchema throws "Unexpected JSON Schema input for structure: {}" error when useRefs is true when structure is first child of intersection.

[HamishWHC]

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🧩 Context

• ArkType version: 2.2.0
• TypeScript version (5.1+): 6.0-beta
• Other context you think may be relevant (JS flavor, OS, etc.): Bun + node

🧑‍💻 Repro

Playground Link: https://arktype.io/playground?code=import%2520%257B%2520type%2520%257D%2520from%2520%2522arktype%2522%250A%250Aconst%2520Thing%2520%253D%2520type%28%257B%2520a%253A%2520%2522string%2522%2520%257D%29.or%28%2522null%2522%29%250A%250Aconsole.log%28Thing.toJsonSchema%28%257B%2520useRefs%253A%2520true%2520%257D%29%29%250A%250Aconst%2520out%2520%253D%2520Thing%28%257B%250A%2509a%253A%2520%2522string%2522%250A%257D%29%250A

const Thing = type({ a: "string" }).or("null")
console.log(Thing.toJsonSchema({ useRefs: true }))

Note: in my code, useRefs is being set to true due to cyclic types, but this is the minimal repro.

[pullfrog]

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