add changeset for cloudflare#585 (cloudflare#592)

.changeset/tender-suns-agree.md

@@ -0,0 +1,15 @@
+---
+'@cloudflare/next-on-pages': patch
+---
+
+ignore invalid `_error` functions in the App router
+
+In the App router, error boundaries are implemented as client components (see: https://nextjs.org/docs/app/api-reference/file-conventions/error),
+meaning that they should not produce server side logic.
+
+The Vercel build process can however generate `_error.func` lambdas (as they are useful in the
+Vercel network I'd assume), through experimentation we've seen that those do not seem to be
+necessary when building the application with next-on-pages so they should be safe to ignore.
+
+The changes here make such invalid `_error.func` lambdas (if present) ignored (as they would otherwise
+cause the next-on-pages build process to fail)