[BUG] For questions, visual previews in plan mode don't show past 7 lines

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?

When in plan mode and you ask anything that prompts a question from Claude about which visual you like more, such as "In ASCII show visually how X would show vs Y" or sometimes even broader "In ASCII how does your proposed feature X visually show?" it can come back with a question to choose from 2 or 3 styles.
You can then select each one and on the right side it - _is supposed to_ - render the differences so the user can choose. However, it only renders the first ~7 lines of the UI. The rest are shown as hidden. I find that in ~80% of the cases you simply don't see enough to make a decision, so it's incredibly useless and frustrating. Often forcing me to just choose whatever "sounds best" in text. Follow-up with "show me properly, full ASCII mocks and differences" is only possible if you hit Esc or press "Talk about it" when that option arises in a later follow-up.

<img width="1348" height="631" alt="Image" src="https://github.com/user-attachments/assets/e5d54bbf-db56-48a0-bb7b-3a705113a056" />

What Should Happen?

It should render fully and you should be able to scroll down to analyze the different UI mocks it presents.

Error Messages/Logs

Steps to Reproduce

1. ask anything that prompts a question from Claude about which visual you like more, such as "In ASCII show visually how X would show vs Y" or sometimes even broader "In ASCII how does your proposed feature X visually show?"
2. it _can_ come back with a question to choose from 2 or 3 styles.
3. observe

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.86

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_