browser_eval always fails: "undefined is not an object (evaluating 'c.split')"

Description

browser_eval fails on every call with an internal bridge error, regardless of the evaluated code or the page. Other browser tools (get_text, get_html, query, snapshot) work fine on the same tabs.

Error returned for any input:

undefined is not an object (evaluating 'c.split')

Reproduces 100% on every page tested (example.com, heavy SPA sites), so it is not page-related. Looks like the CDP Runtime.evaluate response handler in the bridge/extension calls .split() on an undefined value.

Plugins

browser extension (live Chrome bridge)

OpenCode version

1.18.18

Steps to reproduce

1. Open any tab in a group where eval is enabled (e.g. group debug)
2. Call browser_eval with trivial code, e.g. 1+1
3. Observe the same error for document.title, JSON.stringify({...}), etc.

Expected: expression is evaluated and its JSON-serializable result returned.

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

Windows Terminal