If the title doesn't say enough then let me explain.
The Minecart Furnace if you didn't know can link other minecarts from the back with it. The problem is going up inclines and making turns will often disconnect the carts and cause them to phase through each other, not to mention linking the carts together is painful and tedious.
What I'm asking is for you make it so the carts don't disconnect when they go up or down inclines and around turns. An optional fix also is make linking the carts together easier.
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're actually already tracking this issue in MC-158363, so I resolved and linked this ticket as a duplicate.
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Want to quickly add that yes I do use the minecart with furnace and I use it quite often and I would use it more if the bugs with linking carts were fixed.