Status line disappears after briefly appearing

Description

The status line briefly appears (e.g., during the "thinking" phase) then disappears and doesn't come back. Restarting Claude Code does not fix it.

Configuration

~/.claude/settings.json:

{
  "statusLine": {
    "type": "command",
    "command": "~/bin/gitBranches.sh"
  }
}

The script reads JSON from stdin, extracts workspace.current_dir, and outputs a single line with the current git branch:

#!/bin/bash
input=$(cat)
DIR=$(echo "$input" | jq -r '.workspace.current_dir' 2>/dev/null)

if [ -z "$DIR" ] || [ "$DIR" = "null" ]; then
    DIR="$PWD"
fi

if ! git -C "$DIR" rev-parse --git-dir > /dev/null 2>&1; then
    echo "no repo"
    exit 0
fi

CURRENT=$(git -C "$DIR" branch --show-current 2>/dev/null)

if [ -n "$CURRENT" ]; then
    echo "branch: $CURRENT"
else
    echo "detached HEAD"
fi

What I've verified

• Script is executable (chmod +x)
• jq is available
• Script produces correct output when tested manually:

``
$ echo '{"workspace":{"current_dir":"/path/to/repo"}}' | ~/bin/gitBranches.sh
branch: my-feature-branch
``

• Script always produces output (fallbacks for no-repo and detached HEAD cases)
• Script exits with status 0
• Tried having the config in ~/.claude/settings.json only (no project-level override)
• Tried having it in .claude/settings.local.json and .claude/settings.json at the project level
• Restarted Claude Code multiple times

Observed behavior

• Status line briefly appears during the "thinking" phase of a response
• Status line disappears after the response completes
• Status line does not reappear until the next "thinking" phase

Expected behavior

Status line should persistently display the script output, updating after each assistant message per the docs.

Environment

• Platform: Linux (Cloud Workstation)
• Shell: zsh