Hello,

In bedrock, a machine known as a "loader and deloader" which is a rail cart system involving a hopper on a railcart(hor). this mechanism makes for the very useful ability to put all of the items from a hopper on a minecart into a stationary chest before receiving a signal from a comparator to send the minecart back down the railway it came in once it is empty. Once the hor reaches a hopper with a golden railcart on top of it, the hor will stop if it has items inside it because it will start to send its items to the other hopper, which will then send a signal to a comparator so that the signal is used to power off the railcart therefore stopping the hor in its track. 

the issue. In consoles and only consoles ( I looked around to try to find it on YouTube and here), the hor does not stop because the golden rail does not power off and from what I could deduce, the hor and hopper underneath it do not deload items at the same time as Java or mobile editions which renders the mechanism useless. However, there may be another reason its being caused. It is nothing on my part, if I need to give a better explanation, like a visual or video I can send it to better explain.

summary

This console exclusive bug prevents hoppers on minecarts to function properly which therefore causes the inability to create more advanced redstone mechanisms