There's a reason you don't see the Phone icon in stock launcher... It doesn't matter that it's installed - the app is there because the Wi-Fi-only and the LTE variants of Mi Pad 4 use the same ROM. The Phone app isn't crashing, it's exiting itself, because your device was not intended to use it.
The lockscreen wallpaper animation IS the "unlock screen animation".
And it only works with static wallpapers and certain live wallpapers.
Huh? What update do you expect when there are no Global Beta ROMs for tulip for almost 2 months now? (and won't be, Global Beta was terminated by Xiaomi)