When any entity (including a player) rides a vehicle, its hitbox has still the same size. This is mostly problematic for boats and minecarts as there you would be able to attack a player from underneath a boot or as seen here a player could get "for no reason" damage.
Linked issues
is duplicated by 11
MC-277571
Entity's hitbox bigger than a mount's bottom, making it possible for the entity to take damage from a block underneath the mount's bottom.
Resolved
MC-268237
Attribute scale doesn't consider hitbox of the bigger entity while riding
Resolved
MC-259870
Passing over the lava by boat can lead to ignition
Resolved
MC-228964
Fire while riding a Minecart
Resolved
MC-224628
Lava burns you when your boat is on a lava cauldron
Resolved
6 more links
relates to 4
MC-116806
Wrong position of the player sitting in the minecart or boat during the opening / closing of the shulker box
Open
MC-210607
Using a spawn egg on zombies, zombie villagers, piglins, or zombified piglins in a filled boat causes the baby to suffocate in the ground
Open
MC-90099
Player flying with Elytra has incorrect hitbox
Resolved
MC-256652
Endermen are almost unable to attack Players on a Camel
Resolved
Attachments
Comments 28
Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.
This is an automated comment on any open or reopened issue with out-of-date affected versions.
Affects 18w31a. Better steps to reproduce: Sit in a Minecart, press F3+B, then F5 and teleport the minecart up: "/tp @e[type=minecraft:minecart] ~ ~20 ~"
The Player Hitbox changes when flying or swimming, so this Issue should be attended too.
18 more comments
Confirmed for 16w07b