[BUG] Unexpected loadManifest(/.next/server/preview-props.json) call on Next.js 16.4 canary #1355

Describe the bug

Next.js canary (16.4.0-canary.3) moved preview props out of prerender-manifest.json into a new standalone .next/server/preview-props.json (PREVIEW_PROPS_MANIFEST). NextNodeServer.getPreviewProps() loads it from the Server constructor, so every dynamic route 500s:

 Error: Unexpected loadManifest(/.next/server/preview-props.json) call!
     at loadManifest (.open-next/server-functions/default/handler.mjs)
     at NextNodeServer.getPreviewProps
     at new Server
     at new NextNodeServer

The file is present in the build output, but doesn't match the glob in load-manifest.ts:

**/{*-manifest,required-server-files,prefetch-hints}.json

Steps to reproduce

1. Build any Next.js app on next@16.4.0-canary.3 with @opennextjs/cloudflare@1.20.2 (opennextjs-cloudflare build)
2. opennextjs-cloudflare preview
3. Request any non-prerendered route → 500

Expected behavior

The route renders, as it does on next@16.2.3. Same shape as #1157 / #1160 (prefetch-hints.json) — adding preview-props to the glob fixes it, verified locally.

@opennextjs/cloudflare version

1.20.2

Wrangler version

4.125.0

next info output

-

Additional context

No response