The astrophotography feature lets users capture the night sky by pointing their phone up and keeping it still, either by balancing it on a nearby object or putting it on a tripod.
According to The Verge, this feature is still available on the phones' other cameras, but if you go to Night Sight mode and switch to the ultra-wide-angle camera you will now get a warning saying "Zoom to 1x for astrophotography."
Before the update, it would say "Astrophotography on."
As per the report, the feature was a selling point of the Pixel 4 and was available on the regular and telephoto cameras. When the 4a 5G and 5 were announced with new wide-angle lenses, the feature was added to those as well.
Google has not provided any official explanation as to why it is removing Astrophotography from ultra wide-angle cameras.