Can you help me debug HTTP 416 error, prerendered blog

[alexbjorlig]

When the Linkedin post inspector attempts to generate a preview of my pre-rendered content, it fails with HTTP 416.

Can you please help me debug - where do I go from here? How do I debug requests made to pre-rendered content?

Observations, details:

• The URL is https://21risk.com/blog/migration-from-cypress-to-playwright-hype-or-great, but it happens on all pre-rendered routes.
• The app is hosted on Heroku. The Heroku logs look like this: router web.1 416 GET 21risk.com /blog/migration-from-cypress-to-playwright-hype-or-great 108.174.5.113 at=info method=GET path="/blog/migration-from-cypress-to-playwright-hype-or-great" host=21risk.com request_id=b82d74d8-e854-4b4b-ba97-8bf6da8baceb fwd="108.174.5.113,172.71.174.234" dyno=web.1 connect=0ms service=1ms status=416 bytes=167 protocol=https.
• There are no logs from Sveltekit itself
• The error also happens on https://aveiro-server-prod.herokuapp.com/blog/migration-from-cypress-to-playwright-hype-or-great
• Error does NOT happen, if the content is not pre-rendered (21risk.com/login)
• We are running Kit v 1.11.0, and using the node.js adapter.
• Talked to Heroku support, and they are 100% positive it's the application (i.e. Kit), that throws the 416 error.