Config worktreeRoot isn't respected

[looeee]

~/.pi/agent/pi-worktrees-settings.json:

{
  "worktrees": {
    "**": {
      "worktreeRoot": "{{mainWorktree}}-worktrees",
      "onCreate": []
    }
  }
}

Close and reopen pi.

Then type "/worktree settings" and I see the output:

Worktree Settings:
 ━━━━━━━━━━━━━━━━━━

 worktreeRoot: {{mainWorktree}}.worktrees
 onCreate:     echo "Created {{path}}"

If I do /worktree create test then the test worktree is still created at {{mainWorktree}}.worktrees instead of {{mainWorktree}}-worktrees.