[MC-99640] Players and mobs don't take vertical knockback when already in the air

The bug

When you hit something, it will fly backwards and jump up into the air slightly. Normally, if you hit it again when it's already been flung into the air, it gains more backward and upward velocity. In the current version, the second hit will only cause horizontal velocity, and hit the ground at the same time as if it didn't get hit.

The bug doesn't happen every time, so don't close this after testing it once without it happening. I'm not sure exactly what causes it to work or not, but everyone I've talked to has had it happen to them. It seems like it happens more often with players than mobs.

How to reproduce

Video demonstrating the issue: https://youtu.be/TRe-OVh04yg

Related issues

relates to

MC-102554 Entities with their "NoGravity" tag set to "1b" don't receive any vertical knockback

Comments

migrated 2016-11-19T16:18:57Z

Can confirm for 1.11

wobst.michael 2018-02-18T17:37:59Z

Is this still an issue in the most recent versions (currently that is 1.12.2, or the latest 1.13 development snapshot 18w07c) of Minecraft?

Qwuiblington 2018-02-19T06:15:30Z

yea

Qwuiblington 2018-02-19T06:39:29Z

yea pt2

Uriel Salischiker 2018-10-02T20:24:24Z

Is this still a issue in the latest version of the game(currently 1.13.1)?

If so, please add it to the affected versions, thanks!

Qwuiblington 2018-10-03T01:35:30Z

it happens on turtles at least

i'll test on players later

j_p_smith 2020-06-30T21:00:05Z

Confirmed in 1.16.1.

pulpetti 2020-07-15T10:26:24Z

Still in 20w28a

migrated 2020-07-18T05:12:37Z

Appears to be fixed in Combat Test 5, although that might not count as it is a fork of an outdated version.

migrated 2020-07-26T12:16:15Z

l'll add to this post, they dont take vertical knockack when falling down, fixing this would balance pvp alot as players can easily abuse critical hits which do 150% damage in the current pvp meta.

migrated 2021-02-19T20:27:19Z

Affects 21w07a

migrated 2021-05-12T09:57:28Z

This is the same issue with MC-3756

ampolive 2021-09-13T19:50:23Z

Can confirm in 1.17.1.

Avoma 2022-07-27T12:11:17Z

Can confirm in 1.19.

Avoma 2022-08-28T19:00:09Z

Can confirm in 1.19.2.

SeaOfPixels 2024-06-11T03:11:33Z

Works as intended, this is how it's currently designed for the current combat system. This is going to be intentionally changed in the Combat Tests, as an intended change to the system, not a bug fix. This means this is not a bug.

SeaOfPixels 2024-06-11T05:28:41Z

This was an intentional change in 15w49a, knockback dealt against entities that are already airborne are not supposed to have their y-axis altered.