'Go to v7.1' guides leads to 'unknown error'

0. (not necessary, but important for ux): search for "input component ember" on your favorite search engine
2. Be linked to old guides: https://guides.emberjs.com/v3.14.0/templates/input-components/
3. Click [Go to v7.1.0](https://guides.emberjs.com/release/templates/input-components/)
4. See unknown error:
```
vendor-f43023b3037e0…e4ceb2ce80b.js:6627
GET https://www.google-analytics.com/analytics.js net::ERR_BLOCKED_BY_CLIENT
vendor-f43023b3037e0…e4ceb2ce80b.js:3570
GET https://guides.emberjs.com/content/v7.1.0/templates/input-components.json 404 (Not Found)
vendor-f43023b3037e0…e4ceb2ce80b.js:3570
GET https://guides.emberjs.com/content/v7.1.0/templates/input-components/index.json 404 (Not Found)
vendor-f43023b3037e0…e4ceb2ce80b.js:2872 Error while processing route: version.show Ember Data Request GET /content/v7.1.0/templates/input-components/index.json returned a 404
Payload (text/html; charset=utf-8)

Page not found
```

https://github.com/user-attachments/assets/c252802e-f353-4d81-bf34-085a7f21da9a

Reproduce the redirect from the v3.14.0 input-components guide to the v7.1.0 guide and inspect the version.show route and requested content paths. Trace why /content/v7.1.0/templates/input-components.json and index.json return 404; done means the Go to v7.1.0 link opens the expected guide without the unknown-error page.

Written by the indexing model from the issue text.