Spacebar intermittently types literal 'space' string instead of space character

Description

When pressing the spacebar, approximately 30-40% of the time the literal string "space" is typed instead of an actual space character. This started occurring around January 7, 2026.

Environment

• Claude Code version: 2.1.1
• OS: macOS Darwin 24.6.0
• Terminal: iTerm.app (xterm-256color)
• Input mode: Vim mode enabled
• Window manager: Amethyst

Steps to Reproduce

1. Run Claude Code in iTerm with vim mode enabled
2. Type normally, pressing spacebar between words
3. Observe that ~30-40% of spacebar presses insert the literal string "space" instead of a space character

Expected Behavior

Spacebar should always insert a space character.

Actual Behavior

Spacebar intermittently inserts the literal string "space" instead of a space character.