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Interestingly, this may have been broken for some time, but less common.

2.0.0-2.1.latest:

[CODE="php"]protected function _preSave()

{

   if ($this->prefix_id && ($this->isChanged(['prefix_id', 'node_id'])))

   {

      if (!$this->Forum->isPrefixValid($this->prefix_id))

      {

         $this->prefix_id = 0;

      }

   }

}[/CODE]

But yeah I think silently skipping is about the best we can do here.