In my opinion I think ice should melt. It would be cool if it stayed frozen in cold areas and melted in hot areas. It would also be a good way to obtain water. Along with that if someone lets out water when its cold out is should freeze.
I’m gonna be ‘that guy’ 
https://forum.playboundless.com/search?q=ice%20melting
It’s been discussed elsewhere 
I still think it should melt.
Go put it in lava and it melts…