Terminal Flickering and State Reset in iTerm2 on macOS After Plan Approval

Question

**Bug Description**
There's a significant UI glitch in iTerm2 on macOS. This is a more specific issue. After I approve a plan, especially when it seems to involve a Task or Subagent, the entire terminal session starts to flicker erratically. After the flickering stops, the session's state reverts to what it was before the plan was even presented, and I see Claude starting to think about creating a plan all over again.

**Environment Info**
- Platform: macos
- Terminal: iTerm.app
- Version: 1.0.2