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`{literal}{/literal} {literal}{/literal} {literal}{/literal} ` in received emails

I'm using Mosaico Template as Pretty Workflow Template (I installed mosaicomsgtpl extension.

All received messages have this writing in header: {literal}{/literal} {literal}{/literal} {literal}{/literal}

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I have noticed that at row 246 of prettyworkflowmessages.php there are these row:

  // add literal tags for style tag, this is to prevent smarty errors
  // mosaico template adds style tag to the html content
  $prettyHTML = str_replace('<style type="text/css">', '{literal}<style type="text/css">', $prettyHTML);
  $prettyHTML = str_replace('</style>', '</style>{/literal}', $prettyHTML);

Why? {literal} remains in delivered email...