I recently rolled two 5-star dragons - the thunderclaw and snow wraith. I believe it let me collect the reward for the thunderclaw, but not the snow wraith. However, in the book of dragons, it says I have recieved the reward for the snow wraith (even though I never got it), whilst the thunderclaw reward is still not unlocked (even though I got the reward for it).
I opened up a support ticket in the app but unfortunately the app wouldn’t let me upload images, so I was redirected here. The ticket number is #630044 . Thank you very much for the help!!