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.
Related issues
is duplicated by
MC-96290
A mobs hitbox in a boat will stick out, causing it to burn in lava
MC-98749
The Player has an incorrect hitbox when riding a boat.
MC-116733
Hitbox of a mob sitting in a boat not accurate
MC-165380
Player hitbox show incorrectly when in a boat
MC-203841
Player catches on fire if standing on a rideable entity close to lava
MC-208831
Boats hanging over lava bug
MC-224628
Lava burns you when your boat is on a lava cauldron
MC-228964
Fire while riding a Minecart
MC-259870
Passing over the lava by boat can lead to ignition
MC-268237
Attribute scale doesn't consider hitbox of the bigger entity while riding
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.
relates to
MC-116806
Wrong position of the player sitting in the minecart or boat during the opening / closing of the shulker box
MC-90099
Player flying with Elytra has incorrect hitbox
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
MC-256652
Endermen are almost unable to attack Players on a Camel
Attachments
Comments
migrated
SunCat
Confirmed for 16w07b
migrated
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This is an automated comment on any open or reopened issue with out-of-date affected versions.
bemoty
Can confirm for MC 1.12.1.
JUE13
Can confirm for 18w30b.
migrated
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.
migrated
Confirmed for 1.13.1.
JUE13
Confirmed for 19w37a.
ItsTinay
Confirmed for 1.16 pre-release 3
pulpetti
In 1.16.4 and 20w46a
Avoma
Can confirm in 21w03a.
Avoma
Can confirm in 21w05a.
Avoma
Can confirm in 21w05b.
Avoma
Can confirm in 21w06a.
Avoma
Can confirm in 21w07a. Video attached.
Avoma
Can confirm in 21w11a.
Avoma
Can confirm in 21w13a.
Avoma
Can confirm in 21w15a.
migrated
Can confirm in 21w18a.
migrated
Affects 1.17
Avoma
Can confirm in 1.17.1.
Avoma
Can confirm in 1.18.
Avoma
Can confirm in 1.18.1.
Avoma
Can confirm in 1.18.2.
Avoma
Can confirm in 1.19.
Avoma
Can confirm in 1.19.2.
JUE13
Can confirm in 22w42a
ZYX_2D
1.19.3.
migrated
Affects 1.20.1 Release Candidate 1