The juicy bit:

In August, a Github contributor called “3esmit” recommended a code change that initWallet should be called when being deployed which at the time was considered a convenience enhancement. Thus, we committed this proposed enhancement to the library contract that would automatically initialize it by calling initWallet on construction. Interpreting the recommendation as enhancement, the changed code was to be deployed in a regular update at a future point in time.

Someone noticed and mentioned the issue in August, but it wasn't considered critical and thus not fixed for the already deployed contract.