Dynamic ODB routes take precedence over specific SSR routes

[ascorbic]

If a dynamic route exists that uses fallback=blocking or ISR, and so needs an ODB, we generate a rewrite pointing at the ODB handler. However we don't do the same for SSR routes, and instead rely on falling-through to a root-level rewrite pointing at the regular handler. This means that if a specific SSR route also matches a dynamic ODB route then it doesn't fall through, meaning that it is served by the wrong handler. This causes issues such as #1068 but possibly more subtle ones that aren't as immediately obvious as a missing query param.

The fix is to generate rewrites for every route, which we had hoped to avoid as it can mean a lot of rules. Alternatively, work out a way to normalise and combine rules that match the same requests.