What are things that Mormons Prophets have said would “come to pass” but never did?

Sorry to be super active in this subreddit, but I was wondering: Is there anything that the Prophet said “would happen” at a certain time or before their death that just never happened?

Sources and Evidence would be much appreciated, I am trying to build a list of things that prove they are false prophets!

That’s all, thank you so much to this subreddit for your help!