Compare page OG image renders empty state on production #2431

The OG image for the compare page always renders the empty state on production, even when packages are provided via query params.

URL: https://npmx.dev/compare?packages=zustand,redux&view=charts

Expected: OG image shows package comparison with download bars (zustand vs redux)
Actual: OG image shows generic "Compare npm packages side-by-side" empty state

Evidence

• Works correctly on local dev server (localhost:3001)
• On Vercel production, the nuxt-og-image-options script tag in the page HTML contains the correct serialized props (packages: ["zustand", "redux"])
• But the rendered OG image (both PNG and HTML endpoints) shows the empty state; packages never reach the component
• Even cache-busted fresh renders (x-vercel-cache: MISS) produce the same empty image
• The etag is identical across all URL variations (with/without _query, with/without packages)

Reproduction

# Works locally (dev):
curl http://localhost:3001/__og-image__/image/compare/og.png?packages=zustand,redux -o local.png

# Broken on production:
curl 'https://npmx.dev/__og-image__/image/compare/og.html?packages=zustand,redux' | grep -i 'zustand'
# Returns nothing — empty state

Introduced in

PR #2277 (feat: add OG image for compare pages) — merged Apr 6