Firefishy left a comment (openstreetmap/openstreetmap-website#6219)
Likely related to the exception being thrown when opening the Map Layers panel:
```
application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:32096
Uncaught TypeError: Cannot read properties of undefined (reading 'find')
at NewClass.onAdd
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:32096:50)
at NewClass._layerAdd
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:23670:10)
at NewClass.fire
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:17379:11)
at NewClass._resetView
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:21084:11)
at NewClass.setView
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:20092:10)
at setView
(index-0f15772a813d980151039882284d8f66967c8c119f39a76b316bcfdca91b7652.js:1489:19)
at HTMLDivElement.shown
(index-0f15772a813d980151039882284d8f66967c8c119f39a76b316bcfdca91b7652.js:1476:11)
at HTMLDivElement.dispatch
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:5135:27)
at HTMLDivElement.<anonymous>
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:4939:28)
at Object.trigger
(application-996133772a2ed2520ff9c51f898158e3039aaebd4c5398cf52d6d905bc7744b2.js:8619:12)
```
The issue is: `const matchedLanguage = supportedLanguages.find(`
```
onAdd: function (map) {
L.MaplibreGL.prototype.onAdd.call(this, map);
const maplibreMap = this.getMaplibreMap();
const supportedLanguages = maplibregl.Map.prototype.supportedLanguages;
for (const preferredLanguage of OSM.preferred_languages) {
const normalizedPreferredLanguage = preferredLanguage
.toLowerCase()
.replace("-", "_");
const matchedLanguage = supportedLanguages.find(
(supported) => supported.toLowerCase() === normalizedPreferredLanguage
);
if (matchedLanguage) {
maplibreMap.setLanguage(matchedLanguage);
break;
}
}
```
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