[BUG] 2.1.87 will delete any capital I followed by a space. Reverting to 2.1.86 it doesn't happen.

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?

Every time I enter a capital I followed by entering a space, the I is backed over (like backspace), lower case I is fine, doesn't happen with any other letter of the alphabet. Claude code is not in vim mode. Claude code suggested opening a bug report.

What Should Happen?

Upper case "I" should be accepted.

Error Messages/Logs

missing I

Steps to Reproduce

1. Type a capital I
2. Press space
3. The I is deleted

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.86

Claude Code Version

2.1.87

Platform

Other

Operating System

Other Linux

Terminal/Shell

iTerm2

Additional Information

Almalinux 10
Linux version 6.12.0-124.45.1.el10_1.x86_64 (mockbuild@x64-builder03.almalinux.org) (gcc (GCC) 14.3.1 20250617 (Red Hat 14.3.1-2), GNU ld version 2.41-58.el10_1.2.alma.1) #1 SMP PREEMPT_DYNAMIC Tue Mar 17 20:41:00 EDT 2026