Minecarts disappear

^{Slightly edited by [MCPE Mod] Auldrick}

I have several systems that automate the collection of crops, and to do this faster I have rails and minecarts with hopper, apparently the chunk only supports two minecarts, because I place the third and this disappears when I go to another place for a long time, I already repeated this several times to see if it remained but it keeps disappearing.

 

Lgk10