wrangler r2 bulk put Issue

[Mohsan57]

What versions & operating system are you using?

wrangler 4.69.0, node 24.14.0, ubuntu 25.10

Please provide a link to a minimal reproduction

https://github.com/Mohsan57/agile-developers

Describe the Bug

When attempting to deploy a Next.js 15 application using @opennextjs/cloudflare, the deployment fails during the "Populating R2 incremental cache..." step. The underlying Cloudflare wrangler command (wrangler r2 bulk put) throws a TypeError: fetch failed while uploading chunks of cached items to the newly created R2 cache bucket.

The upload consistently starts and pushes several batches of objects (e.g., up to 81%) before hanging and crashing with the networking/fetch error.

Steps to reproduce

1. Setup a Next.js (app router) project.
2. Configure OpenNext for Cloudflare (@opennextjs/cloudflare@1.17.1).
3. Set up the required KV, R2, and Queue bindings in wrangler.toml.
4. Run the build step: npx opennextjs-cloudflare build.
5. Run the deploy step: npx opennextjs-cloudflare deploy.
6. See the error trigger during the remote bulk upload phase.

Expected behavior

The opennextjs-cloudflare deploy command should successfully populate the Cloudflare R2 bucket with the Next.js build cache and complete the worker deployment.

Actual behavior

The deployment crashes with:

┌──────────────────────────────┐
│ OpenNext — Cloudflare deploy │
└──────────────────────────────┘

Populating R2 incremental cache...
Starting bulk upload of 61 objects to bucket agile-dev-cache using a concurrency of 50
Uploaded 16% (10 out of 61)
Uploaded 32% (20 out of 61)
Uploaded 49% (30 out of 61)
Uploaded 65% (40 out of 61)
Uploaded 81% (50 out of 61)

▲ [WARNING] 🚧 `wrangler r2 bulk put` is an experimental command. Please report any issues to https://github.com/cloudflare/workers-sdk/issues/new/choose

✘ [ERROR] Error uploading "/media/mohsan/Data/agiledevelopers/agile-developers/.open-next/cache/..."

  TypeError: fetch failed

Logs & Stack Trace

--- 2026-02-26T17:12:44.921Z error
✘ [ERROR] Error uploading "/media/mohsan/Data/agiledevelopers/agile-developers/.open-next/cache/__fetch/uUMv_WooDPbr5_KG74cJB/7e61489bad21b2e6f74912312cfbf4769c1bf3030bbed4d1725692e98eacb3e2"

  TypeError: fetch failed

--- 2026-02-26T17:12:44.921Z debug
Error: Error uploading "/media/mohsan/Data/agiledevelopers/agile-developers/.open-next/cache/__fetch/uUMv_WooDPbr5_KG74cJB/7e61489bad21b2e6f74912312cfbf4769c1bf3030bbed4d1725692e98eacb3e2"
TypeError: fetch failed
    at /media/mohsan/Data/agiledevelopers/agile-developers/node_modules/wrangler/wrangler-dist/cli.js:271602:23
    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
    at async /media/mohsan/Data/agiledevelopers/agile-developers/node_modules/wrangler/wrangler-dist/cli.js:128855:30

Environment

• OS: Linux (Ubuntu)
• Node.js version: v24.14.0
• Package Manager: npm
• Framework Version: Next.js v15.2.8
• OpenNext Version: @opennextjs/cloudflare@1.17.1
• Wrangler Version: 4.69.0

Additional context

The issue seems to be a combination of OpenNext's caching script pushing large bulk data and Cloudflare's experimental wrangler r2 bulk put. Setting NODE_OPTIONS="--dns-result-order=ipv4first" does not alleviate the fetch failure.

Please provide any relevant error logs

No response

[vicb]

@Mohsan57 I am working on this PR that should fix the issue.

(Please use https://github.com/opennextjs/opennextjs-cloudflare for questions about Open Next, thanks)