PreToolUse and PostToolUse hooks loaded but never fire on Windows

Bug description

PreToolUse and PostToolUse hooks are correctly loaded (visible in /hooks) but never fire on Windows. The exact same configuration works perfectly on Linux.

UserPromptSubmit hooks work fine on both platforms.

Environment

• OS: Windows 11 Pro 10.0.22631
• Shell: Git Bash (bundled with Git for Windows)
• Claude Code version: 2.1.42
• Also tested on: Linux (Debian, same version 2.1.42) — works correctly

Configuration (~/.claude/settings.json)

{
  "hooks": {
    "UserPromptSubmit": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "bash ~/.claude/hooks/memory-inject.sh",
            "timeout": 5
          }
        ]
      }
    ],
    "PreToolUse": [
      {
        "matcher": "Bash",
        "hooks": [
          {
            "type": "command",
            "command": "echo \"$(date +%H:%M:%S) PreToolUse fired\" >> /tmp/hook-pre-debug.log",
            "timeout": 3
          }
        ]
      }
    ],
    "PostToolUse": [
      {
        "matcher": "Edit|Write|Bash",
        "hooks": [
          {
            "type": "command",
            "command": "echo \"$(date +%H:%M:%S) PostToolUse fired\" >> /tmp/hook-post-debug.log",
            "timeout": 3
          }
        ]
      }
    ]
  }
}

Steps to reproduce

1. Configure PreToolUse and PostToolUse hooks in ~/.claude/settings.json (see config above)
2. Start Claude Code on Windows (claude)
3. Run /hooks — hooks are listed correctly as [User] Bash (PreToolUse) and [User] Edit|Write|Bash (PostToolUse)
4. Ask Claude to run a Bash command (e.g., echo hello)
5. Check log files — they are never created

Expected behavior

/tmp/hook-pre-debug.log and /tmp/hook-post-debug.log should be created with timestamps, as they are on Linux.

Actual behavior

• Windows: Neither file is created. No error shown. Hooks silently don't fire.
• Linux: Both files are created correctly (23:20:30 PreToolUse fired, 23:20:30 PostToolUse fired).

Investigation done

| Check | Result |
|-------|--------|
| /hooks shows hooks loaded | Yes — [User] Bash and [User] Edit\|Write\|Bash displayed |
| JSON structure valid | Yes — jq validates, same structure as working Linux config |
| UserPromptSubmit hook | Works on Windows |
| PreToolUse hook | Loaded but never fires on Windows, works on Linux |
| PostToolUse hook | Loaded but never fires on Windows, works on Linux |
| Minimal debug hook (no matcher) | Also doesn't fire on Windows |
| Manual command execution | echo "test" >> /tmp/hook-pre-debug.log works fine in Git Bash |
| Settings override | No project-level settings.json, no settings.local.json |

Additional context

The hooks are loaded into Claude Code's internal registry (confirmed by /hooks UI), but the dispatch mechanism for tool-level events (PreToolUse, PostToolUse) appears to not trigger on Windows. Event-level hooks (UserPromptSubmit) work correctly.