Amber Brimberry

Thanks for the link, i attributed it to a crash initially, but afterwards experienced it again without a crash so the other ticket might be more relevant. I'm going to move it and see if the issue stops

I'd like to provide a world save to you, but don't know the process. Please let me know the basic steps if you would still like one as this method might bypass Xbox live restrictions.

I can't provide a picture-I'm running bedrock on XBox one and xbox live is not allowing captures to be uploaded to the online accounts due to volume for the time being. 

Set up: lever block-powered rail-10normal rails-powered rail sitting atop a hopper-lever block on top of barrel.

The minecart hoppers are both empty due to the hopper drop system, but are running at different speeds

Farms are set on the following coordinates measured from lever block on either end (edit they're aligned on z):

Sugar cane (experiencing issue)

(881,68,-212),(868,68,-212)-end with hopper setup

Bamboo farm (no issue)

(864,68,-212),(851,68,-212)-end with hopper setup.

I've noticed that the despawn is usually after I've left the chunk for more than 2+ consecutive game days, and only began since i removed the sugar cane farm from the bamboo farm's observer, giving the sugar cane farm its own. There is only 1 per farm set 5 blocks above the hopper drop.

I have two separate farms set up in exactly the same next to each other using hopper minecarts. The first farm for sugar cane has had the hopper minecart despawn multiple times, while the bamboo farm three blocks separate does not. When the minecart with hopper is replaced, it runs slightly faster than the other. All Redstone, observer, and rail positions are identical, and the farms are aligned on the x axis. The only difference is the water blocks for the sugar farm using 2 source blocks one on either end. The Redstone components are not connected.