[BUG] Pressing "Esc" in a subgents's /btw call also cancels the subagent itself

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Whenever you have Claude code in the terminal spawning subagents and you move your focus into a subagent via inspecting its session, the moment you type /btw and get an answer, it says "Esc" for exiting the /btw call. But the moment you press esc, not only is the /btw call exited, which is the intended behavior. But also the subagent itself is interrupted. That means you have to enter "continue" in its chat. And also the parent session is noticing this, so here's a bug.

What Should Happen?

Only the /btw call should be cancelled.

Error Messages/Logs

Steps to Reproduce

1. Ask Claude code "Research the 3rd millenlial Problem and see if you can find a solution. Use many subagents each should do an in-depth research"
2. Wait until at least one subagent was spawned
3. Move into that subagent's session via "Arrow Down" then "Enter"
4. Use the chat to enter "/btw what did we already found out?"
5. Wait for the /btw call answer
6. Press "Esc" on the keyboard

You subagent is cancelled now - bug!

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.295

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

This bug really hits me 1-2 times a day. Not something random, I really need this bug to be fixed. I wonder why I am the only one using this crucial feature.