"Jupyter Notebook Cell Duplication and Type Conversion During Edits"

Bug Description
When Claude is editing Jupyter Notebooks with a simple code update, it can sometimes duplicate the cell, and the fixed cell is no longer a code cell. This gets quite confusing as it appears after the fixed cell, so it looks like nothing has happened.

Environment Info

• Platform: macos
• Terminal: pycharm
• Version: 1.0.22
• Feedback ID: 8d5e0603-21f1-43b7-8bb2-80cbc06b7261

Errors

[{"error":"Error: Command failed: security find-generic-password -a $USER -w -s \"Claude Code\"\nsecurity: SecKeychainSearchCopyNext: The specified item could not be found in the keychain.\n\n    at genericNodeError (node:internal/errors:983:15)\n    at wrappedFn (node:internal/errors:537:14)\n    at checkExecSyncError (node:child_process:882:11)\n    at execSync (node:child_process:954:15)\n    at zZ (file:///Users/stephen/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:659:3921)\n    at file:///Users/stephen/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:582:8871\n    at Q (file:///Users/stephen/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:17199)\n    at tJ (file:///Users/stephen/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:582:8017)\n    at XS (file:///Users/stephen/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:582:7098)\n    at O6 (file:///Users/stephen/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:582:11210)","timestamp":"2025-06-13T16:13:38.439Z"}]