Could you please post some detail of what the problem is? I understand that you are reporting items missing, but there's some context with the Gnome and a cottage (which it looks like you have moved from) mentioned which I don't know.
I had something like this the other day (sorry, meant to report it but got embroiled in the game and forgot).
I entered the world, and started off in my house. Everything appeared completely normal until I went outside and the animal pen was empty - my pigs, chickens and butterflies were nowhere to be seen, and two each of feeders, meat collectors and milkers were also missing. As I said, everything else appeared normal, so I wondered if it was another 'gnome' incident. I reloaded the game, reappeared back in my house and went downstairs, and this time everything was present and correct - nothing missing at all.
This just happened again, except this time whilst I was dithering about thinking about bug reports, they all appeared. I bet first time this happened, if I'd waited, they'd have appeared then too. This was a longish delay though - long enough for me to come down from the first floor of my house and pace around the piggie patch for a few moments wondering where everybody had gone.