<p></p>
<p><b>@AntonKhorev</b> requested changes on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5474#discussion_r1918595163">app/assets/javascripts/leaflet.map.js</a>:</p>
<pre style='color:#555'>>          this.addLayer(this.baseLayers[i]);
       } else {
+        baselayerChanged = this.hasLayer(this.baseLayers[i]);
</pre>
<p dir="auto"><code class="notranslate">baselayerchange</code> is supposed to be fired <em>once</em> for the layer that became visible. It's not supposed to be fired for removed layers. See that <code class="notranslate">null</code> in Leafet code?<br>
<a href="https://github.com/Leaflet/Leaflet/blob/c511e66c20dce06ac05c43cf287b3ecdba00d924/src/control/Control.Layers.js#L317-L319">https://github.com/Leaflet/Leaflet/blob/c511e66c20dce06ac05c43cf287b3ecdba00d924/src/control/Control.Layers.js#L317-L319</a></p>
<p dir="auto">"This event would be triggered after the other layer events, and it would include a layer property set to the resulting base layer." <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="7531614" data-permission-text="Title is private" data-url="https://github.com/Leaflet/Leaflet/issues/1064" data-hovercard-type="pull_request" data-hovercard-url="/Leaflet/Leaflet/pull/1064/hovercard" href="https://github.com/Leaflet/Leaflet/pull/1064">Leaflet/Leaflet#1064</a></p>

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