Planning stopped working today in Safari

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/report-a-bug/planning-stopped-working-today-in-safari/
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Since today afternoon I'm not able to select any destination from the searchbox as usually. This happens in Safari (even with incognito mode, i.e. all cookies cleared). The same thing works in Chrome. Safari used to work fine this morning.