<p>Further checking in Chrome, it looks like we have to process a several thousand (!) layers for the relations in question. I think it is faily obvious that this is not the best thing to do. Most of these layers seem also pretty empty.</p>
<p>Could it be, that the following JSON fragment returned from Overpass API tricks the application into creating those useless layers?</p>
<div class="highlight highlight-source-json"><pre>    {
      <span class="pl-s"><span class="pl-pds">"</span>type<span class="pl-pds">"</span></span>: <span class="pl-s"><span class="pl-pds">"</span>way<span class="pl-pds">"</span></span>,
      <span class="pl-s"><span class="pl-pds">"</span>ref<span class="pl-pds">"</span></span>: <span class="pl-c1">7660203</span>,
      <span class="pl-s"><span class="pl-pds">"</span>role<span class="pl-pds">"</span></span>: <span class="pl-s"><span class="pl-pds">"</span><span class="pl-pds">"</span></span>,
      <span class="pl-s"><span class="pl-pds">"</span>geometry<span class="pl-pds">"</span></span>: [
      ]
    },</pre></div>
<p><a href="https://user-images.githubusercontent.com/5842757/29006312-98507e4c-7aed-11e7-92ce-ed2c0e5e99fd.png" target="_blank"><img src="https://user-images.githubusercontent.com/5842757/29006312-98507e4c-7aed-11e7-92ce-ed2c0e5e99fd.png" alt="grafik" style="max-width:100%;"></a></p>

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