After try the way in issue
Now I still meet same issue using /postgresin prod after add env VERCEL_UNDICI = 1 and redeploy.
Unhandled Rejection: NeonDbError: Error connecting to database: fetch failed at execute (/var/task/node_modules/@neondatabase/serverless/index.js:1548:25) at processTicksAndRejections (node:internal/process/task_queues:95:5) at runNextTicks (node:internal/process/task_queues:64:3) at process.processImmediate (node:internal/timers:454:9) at process.callbackTrampoline (node:internal/async_hooks:130:17) { severity: undefined, code: undefined, detail: undefined, hint: undefined, position: undefined, internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: undefined, line: undefined, routine: undefined, sourceError: TypeError: fetch failed at node:internal/deps/undici/undici:13178:13 at processTicksAndRejections (node:internal/process/task_queues:95:5) at runNextTicks (node:internal/process/task_queues:64:3) at process.processImmediate (node:internal/timers:454:9) at process.callbackTrampoline (node:internal/async_hooks:130:17) at async execute (/var/task/node_modules/@neondatabase/serverless/index.js:1547:21) { [cause]: ConnectTimeoutError: Connect Timeout Error (attempted addresses: 100.26.116.133:443) at onConnectTimeout (node:internal/deps/undici/undici:2331:28) at node:internal/deps/undici/undici:2283:50 at Immediate._onImmediate (node:internal/deps/undici/undici:2315:13) at process.processImmediate (node:internal/timers:483:21) at process.callbackTrampoline (node:internal/async_hooks:130:17) { code: 'UND_ERR_CONNECT_TIMEOUT' } } } Node.js process exited with exit status: 128. The logs above can help with debugging the issue.Unhandled Rejection: NeonDbError: Error connecting to database: fetch failed at execute (/var/task/node_modules/@neondatabase/serverless/index.js:1548:25) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) { severity: undefined, code: undefined, detail: undefined, hint: undefined, position: undefined, internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: undefined, line: undefined, routine: undefined, sourceError: TypeError: fetch failed at /opt/rust/undici.js:40:5166 at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async execute (/var/task/node_modules/@neondatabase/serverless/index.js:1547:21) { [cause]: Error: Client network socket disconnected before secure TLS connection was established at TLSSocket.onConnectEnd (node:_tls_wrap:1738:19) at TLSSocket.emit (node:events:531:35) at endReadableNT (node:internal/streams/readable:1696:12) at process.processTicksAndRejections (node:internal/process/task_queues:82:21) { code: 'ECONNRESET', path: undefined, host: 'api.us-east-1.aws.neon.tech', port: 443, localAddress: null } }}Deployment URL or Custom Domain:Environment (local, preview, production):Project Framework:Build Settings: Framework Preset: Build Command (if not default): Output Directory (if not default): Install Command (if not default):Node/Runtime Version:Package Manager:Relevant Packages: