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</head>

Replace with

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [{
    "@type": "ListItem",
    "position": 1,
    "name": "{$mybb->settings['bbname']}",
    "item": "{$mybb->settings['bburl']}"
  },{
    "@type": "ListItem",
    "position": 2,
    "name": "{$forum['name']}",
    "item": "{$mybb->settings['bburl']}/forum-{$fid}.html"
  },{
    "@type": "ListItem",
    "position": 3,
    "name": "{$thread['subject']}",
    "item": "{$mybb->settings['bburl']}/thread-{$thread['tid']}.html"
  }]
}
</script>
</head>

why you add this in showthread templates ?