Tested 100 minecarts being destroyed by cactus
Zero hoppers dropped.
Tried with skeletons fireing also zero dropped.
Exploding Tnt drops some but It should be all.
*Additional information by [~Auldrick]:*
In Survival mode:
Destroyed by | Drops: Minecart | Hopper | Hopper Contents |
Cactus | Yes | No | Yes |
Arrow | Yes | No | Yes |
TNT | Yes | No | Yes |
Pickaxe | Yes | Yes | Yes |
In Creative mode:
Destroyed by | Drops: Minecart | Hopper | Hopper Contents |
Cactus | Yes | No | Yes |
Arrow | No | No | No |
TNT | No | No | No |
Pickaxe | No | No | Yes |
In testing with cactus, there was a possibility that the hopper might land on the cactus and being destroyed. I used a hopper under the rail to try to grab the drops before this could happen. The hopper successfully grabbed the minecart and/or hopper contents, but never a hopper.
To test with an arrow in Creative, you have to initially aim at something else, then slide to target the minecart with hopper while holding down the use control.
Related issues
Comments


I can sometime whithin the next 24hours, maybe, i got work atm so will leave an update when i check.

This has indeed corrected the drops for every method i tested.
Creative.
Cactus, minecrat yes, hopper yes, content yes
Dispenser arrow, minecart yes, hopper yes, content yes
Bow arrow, minecarft no, hopper no, content no
TnT, minecrart yes, hopper yes, content yes
Skeleton arrow, minecart yes, hopper yes, content yes
Pickaxe, minecart no, hopper no, content yes
Survival
Cactus, minecrat yes, hopper yes, content yes
Dispenser arrow, minecart yes, hopper yes, content yes
Bow arrow, minecarft yes, hopper yes, content yes
TnT, minecrart yes, hopper yes, content yes
Skeleton arrow, minecart yes, hopper yes, content yes
Pickaxe, minecart yes, hopper yes, content yes

It aslo works for tridents
According to the 1.15.0.55 beta changelog:
Hopper mine carts will now drop hoppers and mine carts when broken with a ranged weapon (MCPE-55859)
Can you verify whether this has also fixed the hoppers dropping with other methods of breaking?