AppleScript can't find Smart Albums on Catalina

I've been using an AppleScript to export photos in a Smart Album in Apple Photos for a while now. After upgrading to Catalina, it seems that my query for all albums no longer returns Smart Albums.

Specifically, I have a line that loads all albums like this:

tell Application "Photos"
    set theseAlbums to every album
    ...
end tell

Previously,

theseAlbums

Is there anything I can do to query for smart albums?

I looked at the Photos Dictionary and didn't see anything. I also tried changing

every album

every container

Here's the code in context - a helper function that finds an album by name:

on getAlbumNamed(thisName)
  tell application "Photos"
    set theseAlbums to every album
    repeat with i from 1 to the count of theseAlbums
      set thisAlbum to item i of theseAlbums
      if the name of thisAlbum is thisName then
        return thisAlbum
      end if
    end repeat
  end tell
end getAlbumNamed

Thanks in advance for any help.