Planet Earth III multiplayer problems

I played and enjoyed new featured world of "Planet Earth III". 

I'd like to use this world for my small class of 10 children. 

I tested multi-play of this world, and found that impalas world doesn't work for multi. 

The task is to collect 10 flowers, but there's only 12 flowers. The number of flower does not increase according to the player number.  

Leopard world is quite difficult.  I finally  jumped on the blue blobbing areas, but nothing occurred. I couldn't see any impalas under the trees. 

Does anyone have any idea to utilize "Planet Earth III" for multiplayers?