Opening Print PDF Modal on a tab with stagehand causes CDPSession.send: Target page, context or browser has been closed

[aditya-silna]

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Environment Information

Please provide the following information to help us reproduce and resolve your issue:

Stagehand:

• Language/SDK: [TypeScript, Python, MCP…]
• Stagehand version: [e.g., 1.0.0]
  Python version 0.5.6

AI Provider:

• Provider: [e.g., OpenAI, Anthropic, Azure OpenAI]
• Model: [e.g., gpt-4o, claude-3-7-sonnet-latest]

N/A

Issue Description

Using `act()` to click a button that opens a PDF modal is not handled by Stagehand's `Page` proxy, and doing CDP operations `stagehand.page.send_cdp()` then causes `CDPSession.send: Target page, context or browser has been closed`

Steps to Reproduce

1. act() on a button that calls JS to open window.print()
2. do `stagehand.page.send_cdp("Target.getTargetInfo")

### Error Messages / Log trace

TargetClosedError
Level: Error
CDPSession.send: Target page, context or browser has been closed