U+23F5 (⏵) renders as tofu in TUI on Ubuntu 26.04 LTS

Environment

• OS: Ubuntu 26.04 LTS (fresh install, released 2026-04-24)
• Claude Code: 2.1.120 (also reproduced on 2.1.119)
• Terminals tested: Ptyxis (VTE_VERSION=8400), xterm
• Shells tested: bash, zsh
• TERM=xterm-256color, COLORTERM=truecolor, LANG=en_US.UTF-8
• Font: JetBrains Mono Nerd Font

Description

U+23F5 (⏵ BLACK MEDIUM RIGHT-POINTING TRIANGLE) renders as a tofu box in Claude Code's TUI. Observed in the accept-edits UI element and in plan mode.

Steps to Reproduce

1. Fresh install of Ubuntu 26.04 LTS
2. Install Claude Code
3. Open any terminal emulator
4. Launch Claude Code and observe the accept-edits UI or enter plan mode

What I Tried

• Both bash and zsh (both affected)
• Two different terminal emulators: Ptyxis and xterm (both affected)
• Stripped environment via env -i HOME=$HOME PATH=$PATH TERM=xterm-256color claude (still affected)
• Bare shell configs (still affected)
• Older Claude Code version 2.1.119 (still affected)
• Character renders correctly in the terminal outside Claude Code
• system wcwidth() returns 1 for the character
• locale is en_US.UTF-8

Conclusion

Issue appears specific to Claude Code's TUI rendering on Ubuntu 26.04. Not reproducible in the shell itself — only within Claude Code's TUI.