Find My not updating people locations

2 days ago I updated my IPhone 13 to IOS 18.0.1 and this morning I noticed the location of my friends is not updated. The locations of their devices are updating without any problems. All settings are checked and haven’t changed since yesterday when everything worked fine. I already found more of this mentioned by other users online since the latest update.

Is it a bug or a malfunctioning app? And most important: is there a fix? Thank you!