[BUG] terminal flickering with long text produced by tasks

Environment

• Platform (select one):
• [ ] Anthropic API
• [ ] AWS Bedrock
• [X] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.16 (Claude Code)
• Operating System: Ubuntu 22.04.5 LTS
• Terminal: putty

Bug Description

sometimes, if the tasks produce a lot of text, there is this behaviour in the video attached. the bug is not blocking, just a little annoying

Additional Context

see attached video

https://github.com/user-attachments/assets/8372daa3-d932-4789-abd6-640922681550