The same thing happened to me after I upgraded the second conveyor 1 time, The 1st conveyor was the only one making toys. So I tried to continue onward and bought the 3rd conveyor to still no avail. The 1st one was still the only one working. Please fix this to keep playing.1/3/20
So this is the response that I have, for after updating the game since bug fix.
1/15/20 at first after the update the problem wasn’t fixed. So since I knew that I wasn’t that far in I decided to try something... I deleted the app then reinstalled it just to try at it again, and voilà it worked. I got to upgrade the second conveyor and it still works. I’m happy that you guys was able to figure out and fix the problem, and keep up the good work. ^_^