<p></p>
<p><b>@hlfan</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5736#discussion_r2023483932">app/assets/javascripts/osm.js.erb</a>:</p>
<pre style='color:#555'>>            mapParams = {};
 
+    [geoURI.coordstring, ...geoURI.params] = geoURI.pathname.split(";");
+    geoURI.params = Object.fromEntries([...geoURI.searchParams, ...geoURI.params.flatMap(l => [...new URLSearchParams(l)])]);
</pre>
<p dir="auto"><code class="notranslate">URLSearchParams.getAll().reduce()</code> is now working for the mentioned cases.</p>

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