How should {{ }} be handled?

[bogdan-pechounov]

Making an API call to https://en.wikipedia.org/w/api.php?format=json&action=query&generator=random&grnnamespace=0&prop=revisions&rvprop=content&grnlimit=1, I got the following wikitext.

                 {{Short description|Species of plant in the family Sapotaceae}}
                 {{Speciesbox
                 | image = 
                 | image_caption =
                 | status = EN
                 | status_system = IUCN3.1
                 | status_ref = <ref name="iucn status 19 November 2021">{{cite iucn |author=Olander, S.B. |author2=Wilkie, P. |date=2019 |title=''Madhuca spectabilis'' |volume=2019 |page=e.T136470583A136470888 |doi=10.2305/IUCN.UK.2019-3.RLTS.T136470583A136470888.en |access-date=19 November 2021}}</ref>
                 | genus = Madhuca
                 | species = spectabilis
                 | authority = [[Pieter van Royen|P.Royen]]<ref name=POWO/>
                 | synonyms = 
                 }}
                 
                 '''''Madhuca spectabilis''''' is a tree in the family [[Sapotaceae]]. The [[specific name (botany)|specific epithet]] ''spectabilis'' means "spectacular", referring to the tree's appearance.<ref name=TFSS/>
                 
                 ==Description==
                 ''Madhuca spectabilis'' grows up to {{convert|26|m|-1}} tall, with a trunk diameter of up to {{convert|40|cm|0|abbr=on}}. [[Inflorescences]] bear eight or more flowers.<ref name=TFSS/>
                 
                 ==Distribution and habitat==
                 ''Madhuca spectabilis'' is [[Endemism|endemic]] to [[Borneo]]. Its habitat is lowland mixed [[dipterocarp]] forest from {{convert|30–450|m|-2|abbr=on}} altitude.<ref name=TFSS/>
                 
                 ==Conservation==
                 ''Madhuca spectabilis'' has been assessed as [[Endangered species (IUCN status)|endangered]] on the [[IUCN Red List]]. The species is threatened by logging and conversion of land for [[palm oil]] plantations.<ref name="iucn status 19 November 2021" />
                 
                 ==References==
                 {{Reflist | refs=
                 
                 
                 
                 <ref name=POWO>{{BioRef | powo | title = ''Madhuca spectabilis'' | id = 787556-1 | accessdate = 26 September 2020}}</ref>
                 
                 <ref name=TFSS>{{Cite book | last1 = Chai | first1 = P. P. K. | last2 = Yii | first2 = P. C. | date = April 2002 | contribution = ''Madhuca spectabilis'' P.Royen | contribution-url = http://www.chm.frim.gov.my/backup/TFSS.vol4_5_6.pdf | editor1-last = Soepadmo | editor1-first = E. | editor2-last = Saw | editor2-first = L. G. | editor3-last = Chung | editor3-first = R. C. K. | title = Tree Flora of Sabah and Sarawak | volume = 4 | pages = 265, 267 | publisher = [[Forest Research Institute Malaysia]] | isbn = 983-2181-27-5 | url = http://www.chm.frim.gov.my/Resources/Publications/Books/Floras/Tree-Flora-of-Sabah-and-Sarawak.aspx | version = (free online from the publisher, lesser resolution scan PDF versions) | accessdate = 26 November 2013 | archive-url = https://web.archive.org/web/20130927074942/http://www.chm.frim.gov.my/Resources/Publications/Books/Floras/Tree-Flora-of-Sabah-and-Sarawak.aspx | archive-date = 27 September 2013 | url-status = dead }}</ref>
                 }}
                 
                 {{Taxonbar|from=Q15326875}}
                 
                 [[Category:Madhuca|spectabilis]]
                 [[Category:Endemic flora of Borneo]]
                 [[Category:Trees of Borneo]]
                 [[Category:Plants described in 1960]]
                 
                 
                 {{Sapotaceae-stub}}

The result of WikiModel.toHtml(content) includes {{ and }}, but the webpage doesn't.

                 <p>{{Short description|Species of plant in the family Sapotaceae}}
                 {{Speciesbox
                 | image = 
                 | image_caption =
                 | status = EN
                 | status_system = IUCN3.1
                 | status_ref = <sup id="_ref-iucn_status_19_November_2021" class="reference"><a href="#_note-iucn_status_19_November_2021" title="">[1]</a></sup>
                 | genus = Madhuca
                 | species = spectabilis
                 | authority = <a href="/Pieter_van_Royen" title="Pieter van Royen">P.Royen</a><sup id="_ref-POWO" class="reference"><a href="#_note-POWO" title="">[2]</a></sup>
                 | synonyms = 
                 }}</p>
                 <p><b><i>Madhuca spectabilis</i></b> is a tree in the family <a href="/Sapotaceae" title="Sapotaceae">Sapotaceae</a>. The <a href="/Specific_name_(botany)" title="Specific name (botany)">specific epithet</a> <i>spectabilis</i> means &#34;spectacular&#34;, referring to the tree&#39;s appearance.<sup id="_ref-TFSS" class="reference"><a href="#_note-TFSS" title="">[3]</a></sup></p>
                 <table id="toc" class="toc" summary="Contents">
                 <tr>
                 <td>
                 <div id="toctitle">
                 <h2>Contents</h2>
                 </div>
                 <ul>
                 <ul>
                 <li class="toclevel-1"><a href="#Description">Description</a>
                 </li>
                 <li class="toclevel-1"><a href="#Distribution_and_habitat">Distribution and habitat</a>
                 </li>
                 <li class="toclevel-1"><a href="#Conservation">Conservation</a>
                 </li>
                 <li class="toclevel-1"><a href="#References">References</a>
                 </li>
                 </ul>
                 </ul></td></tr></table><hr/>
                 <h2><span class="mw-headline" id="Description">Description</span></h2>
                 <p><i>Madhuca spectabilis</i> grows up to {{convert|26|m|-1}} tall, with a trunk diameter of up to {{convert|40|cm|0|abbr=on}}. <a href="/Inflorescences" title="Inflorescences">Inflorescences</a> bear eight or more flowers.<sup id="_ref-TFSS_b" class="reference"><a href="#_note-TFSS" title="">[3]</a></sup></p>
                 <h2><span class="mw-headline" id="Distribution_and_habitat">Distribution and habitat</span></h2>
                 <p><i>Madhuca spectabilis</i> is <a href="/Endemism" title="Endemism">endemic</a> to <a href="/Borneo" title="Borneo">Borneo</a>. Its habitat is lowland mixed <a href="/Dipterocarp" title="Dipterocarp">dipterocarp</a> forest from {{convert|30–450|m|-2|abbr=on}} altitude.<sup id="_ref-TFSS_c" class="reference"><a href="#_note-TFSS" title="">[3]</a></sup></p>
                 <h2><span class="mw-headline" id="Conservation">Conservation</span></h2>
                 <p><i>Madhuca spectabilis</i> has been assessed as <a href="/Endangered_species_(IUCN_status)" title="Endangered species (IUCN status)">endangered</a> on the <a href="/IUCN_Red_List" title="IUCN Red List">IUCN Red List</a>. The species is threatened by logging and conversion of land for <a href="/Palm_oil" title="Palm oil">palm oil</a> plantations.<sup id="_ref-iucn_status_19_November_2021_b" class="reference"><a href="#_note-iucn_status_19_November_2021" title="">[1]</a></sup></p>
                 <h2><span class="mw-headline" id="References">References</span></h2>
                 <p>{{Reflist | refs=</p>
                 
                 
                 <p><sup id="_ref-POWO_b" class="reference"><a href="#_note-POWO" title="">[2]</a></sup></p>
                 <p><sup id="_ref-TFSS_d" class="reference"><a href="#_note-TFSS" title="">[3]</a></sup>
                 }}</p>
                 <p>{{Taxonbar|from=Q15326875}}</p>
                 <p>
                 
                 
                 </p>
                 
                 <p>{{Sapotaceae-stub}}

[serasset]

I guess your WikiModel is unable to get the Templates sources so that they can be executed.