I was testing my new mincart system through the Mesa Biome when i ran into a cactus, because my armor is so good i wasnt taking damage so i didnt care, i placed my minecart then got in it, no longer touching the cactus, but while going along my minecart system away from the cactus i was still taking its damage all the way till i got out the minecart. This instantly made me curious to see if this works on a boat and i built one, it also dose the same thing when in the boat with one difference, the boat also takes damage with you even if the boat isnt touching you or the cactus.

Its not a crazy or large bug but something funny and small i found when mucking around.

Steps to reproduce (Minecart)
1. Have a minecart and track nearbye
2. Run into a cactus
3. While taking damage get into minecart and ride away
4. Still take damage until you are out of the minecart

Steps to reproduce (Boat)
1. Get a boat
2. Run into cactus
3. Get in boat
4. Still take damage until boat brakes or exit.
3~ dont get in boat just place boat
4~ boat brakes

~ means alternate glitch

Edit: I kept testing it and it also works with Horses and Pigs, so anything that you can ride this will happen to.

Edit: I re-tested it and it still happens in 0.15.6

Edit: Yet again it sill exists in 0.15.7

Edit: 0.15.8 Still isn't fixed