TUI sometimes duplicates task panes and status rows during long-running tasks

Summary

The Claude Code TUI sometimes ends up rendering duplicated task panes / status rows while a task is running.

What happened

During a long-running task, the interface appeared to partially re-render on top of itself. The same task block seemed to be shown more than once, and the lower status/action area also looked duplicated.

This made it unclear which task was active and whether the UI was still updating correctly.

Expected behavior

The task area and status rows should render once and update cleanly, without duplicated panes or overlapping lines.

Actual behavior

• The same task appears multiple times
• Separator lines are duplicated
• The bottom status/action row appears duplicated or visually corrupted

Environment

• Claude Code CLI
• macOS
• Observed on 2026-04-04

Additional context

I have a screenshot showing the duplicated rendering state, but I am submitting this issue via CLI so the screenshot is not attached in this report.

It may be related to re-rendering during task/status updates for long-running operations.