As you see in the first Image I have Water Purifier, Forester, Aquafarm, slots in the menu, I can buy them at the Yaosca's harbour cost a lot in resources that I didn't have at this time the second image shows missing menu.
As you see in this image below the missing menu slots! Why! You can see I have a Forester hut, & two Aquafarms I built them last night and first part of the dam just before I save the game last night without cloud and was going to build my second Water purifier today when I loaded my save game, but as you can see at the top of the image the water purifier next to the fishery but I can't build it, so I reloaded an old save to check but no luck and even went back just before I started building the dam and it is still missing!. Wow!. Is there a timer in this menu or what?. This has happen two times to me the first time I played it on the day Eden got released the menu slots was missing after a save game with cloud so had to restart the game again this time I didn't save to cloud and still didn't work I hope Ubisoft release a patch for this menu bug soon. I have waste many hours and time over this Bug after a save. and yes I have verify my files and no change was made.
Here is one of the water purifier but with slots missing