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#11071 Durable Object RPC ReadableStream cancel logs "Network connection lost" and later "IoContext"

Recommendation:KEEP OPEN
Difficulty:n/a
Reasoning:

Confirmed bug: maintainer reproduced and isolated to wrangler/miniflare (not workerd). No fix merged, users awaiting update.

Suggested Action:

Keep open - needs engineering attention for DO RPC stream cancellation error logging fix.

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Analysis Report

Issue Review: cloudflare/workers-sdk#11071

Summary

Canceling a ReadableStream returned from a Durable Object via RPC and proxied by a Worker results in spurious "Network connection lost" and "IoContext" error logs in Wrangler dev.

Findings

  • Created: Oct 23, 2025
  • Updated: Nov 30, 2025
  • Version: 4.44.0 → 4.60.0 (current)
  • Component: wrangler (DO RPC streaming in local dev)
  • Labels: bug, wrangler
  • Comments: 2

Key Evidence

  • Maintainer confirmed bug: @petebacondarwin reproduced the issue on Oct 27, 2025
  • Isolated to wrangler/miniflare: Maintainer noted the error does NOT reproduce with plain workerd, indicating this is a wrangler/miniflare issue, not a workerd runtime issue
  • Working reproduction: https://github.com/IMax153/do-stream-cancel-repro
  • No fix merged: No PRs found that reference issue #11071
  • No changelog entry: Issue not mentioned in wrangler or miniflare changelogs
  • User awaiting update: @schickling asked for updates on Nov 30, 2025

Recommendation

Status: KEEP OPEN

Reasoning: This is a confirmed, unfixed bug that has been validated by a Cloudflare maintainer. The issue has a clear reproduction, the maintainer has already isolated the problem to the wrangler/miniflare layer (not workerd), and no fix has been merged. Users are actively waiting for a resolution.

Action: Keep open. This needs engineering attention to fix the spurious error logging in wrangler dev when DO RPC streams are cancelled.

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