The mob takes damage if you are close to lava or cactus and you can hear its hurt sounds like it's very close to you
Put a tamed mob into the minecart.
Go about 20 blocks away from them.
Walk around lava or cactus.
The mob in the minecart takes damage and even may die.
Linked issues
is duplicated by 3
relates to 1
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Comments 5
Here's a video with range indicators and me seeing if it's some sort of sync issue.
Relates to MC-100468
Another video, this time in Minecraft 1.11 under OS X El Capitan.
Could not reproduce in 15w51b.Reproduced successfully in 15w51b with lava, but not yet with cactus.
Testing conditions:
-Strip mine at y12, with cacti 5 blocks away and lava pool 5-20 blocks away, at the same y value as the tamed minecart dogs.
-Tested while walking in creative.
-Tested with moving and still minecarts that were on powered rails and normal rails.
EDIT: Forgot to mention that I tested this on a locally hosted server (Windows 8.1, amd fx6300 cpu, 4gb ram allocated), if it helps to know mp is also affected.