Generate failing with spatie/fork errors

[efc]

Our static site generation has started to fail with errors in spatie/fork. We see the errors when either version 1.1.3 or 1.2.3 of spatie/fork are installed, but we get no error at all when we remove spatie/fork and generate the site without any workers.

Any thoughts on what might cause this sort of error?

Here is the output of an attempt to generate the site with --workers=4 using v.1.1.3 of spatie/fork...

[✔] Gathered content to be generated
Generating /web/tensegrities/2013/11/11/tweets-of-the-week-71

   ErrorException 

  unserialize(): Error at offset 8152 of 8178 bytes

  at vendor/spatie/fork/src/Task.php:114
    110▕ 
    111▕         $output = $this->output;
    112▕ 
    113▕         if (str_starts_with($output, self::SERIALIZATION_TOKEN)) {
  ➜ 114▕             $output = unserialize(
    115▕                 substr($output, strlen(self::SERIALIZATION_TOKEN))
    116▕             );
    117▕         }
    118▕ 

      +21 vendor frames 

  22  please:18
      Illuminate\Foundation\Application::handleCommand(Object(Symfony\Component\Console\Input\ArgvInput))
Generating /web/tensegrities/2007/08/24/adult-ed
Generating /web/tensegrities/2008/01/05/poster-images-for-theological-terms
efc@Turkey mary % 
   ErrorException 

  socket_write(): unable to write to socket [32]: Broken pipe

  at vendor/spatie/fork/src/Connection.php:79
     75▕             }
     76▕ 
     77▕             $length = strlen($payload);
     78▕ 
  ➜  79▕             $amountOfBytesSent = socket_write($this->socket, $payload, $length);
     80▕ 
     81▕             if ($amountOfBytesSent === false || $amountOfBytesSent === $length) {
     82▕                 break;
     83▕             }

      +24 vendor frames 

  25  please:18
      Illuminate\Foundation\Application::handleCommand(Object(Symfony\Component\Console\Input\ArgvInput))
Generating /web/tensegrities/2004/07/20/will-we-recognize-fascism

   ErrorException 

  socket_write(): unable to write to socket [32]: Broken pipe

  at vendor/spatie/fork/src/Connection.php:79
     75▕             }
     76▕ 
     77▕             $length = strlen($payload);
     78▕ 
  ➜  79▕             $amountOfBytesSent = socket_write($this->socket, $payload, $length);
     80▕ 
     81▕             if ($amountOfBytesSent === false || $amountOfBytesSent === $length) {
     82▕                 break;
     83▕             }

      +24 vendor frames 

  25  please:18
      Illuminate\Foundation\Application::handleCommand(Object(Symfony\Component\Console\Input\ArgvInput))

[efc]

I was using both Feedamic and Bonus Routes on the site that was experiencing these errors. I have no idea if it is related, but after removing these two addons, I now find that I can generate the static site with spatie/fork again.