I agree aerial is broken and my theory is it’s the themes feature they added. Right out of the gate I never even had themes. Did a reset and lo and behold I had themes. This gave me 4, no underwater, Fiddled around with them and they simply do not work. If I try to just use underwater I’m right back to downtown LA. So I have put the other themes back.
I called Apple and they said they have no other reports of this happening. She had me sign out of iCloud, go into screensaver and change it to download weekly, then restart. Change it back to Daily, Did that and I got one more, another Golden Gate Bridge, nothing more since then. I never get the underwater. I might do another reset. I realize they take awhile to load but you at least get a few new ones a day. I have plenty of room, so that isn’t an issue.