On iOS the same problem occurs with all worlds created before the 1.16 update. Copying the world and going into the copy does not fix this problem.
They only give you things if you use a gold ingot. However, they are supposed to pick up all gold items.
I have the same issue in 1.15 iOS
I have the same issue on my iPad Air 4
On iOS the same problem occurs with all worlds created before the 1.16 update. Copying the world and going into the copy does not fix this problem.