Why are the rewards for collections already mastered?

vanjucas

I am getting rather annoyed by completing a task, eg collecting enough responses for the daily collection, only to find it's not a new animal or tree at all, it's already mastered. This week's reward for Barbara's suchi collection is actually also on the medieval countdown, and I'm sure we've had it before because it was already mastered. I can't remember when I last had a NEW animal as a reward. The number of unmastered animals on my farm is dropping rapidly. It makes a nonsense of playing the game if the rewards aren't worth having.