(This is Windows 10 edition with no mods.)
I have an automated sugar cane farm that uses a hopper minecart on a loop to zoom around and pick up the sugar cane that's been broken by pistons. The loop uses powered rails to keep the cart zooming around forever. However, when I save/quit the game and load back later, the minecart is always stopped. I've tried quitting right in the middle of watching the cart go past me, and when I reload it's stopped in front of me.
Based on what I've read online, a minecart is supposed to maintain its momentum when a chunk unloads and then loads again. Am I misunderstanding how this works? Is there some setting I can change? Or is this a bug?