I installed a CH from debian repos (just copied from docs) and installation process asking me for a password, I typed my testing password ended by "();" witouth quotes.

After install I can access without any password.

users.xml show like "<password></password>" for default user.

¯\\\_(ツ)\_/¯

{
        UInt64 pid = 0;
        if (fs::exists(pid_file))
        {
            ReadBufferFromFile in(pid_file.string());
            if (tryReadIntText(pid, in))
            {
                fmt::print("{} file exists and contains pid = {}.\n", pid_file.string(), pid);
            }
            else
            {
                fmt::print("{} file exists but damaged, ignoring.\n", pid_file.string());
                fs::remove(pid_file);
            }