Mobs are able to step up automatically while falling
in 1.8 when pushed by slime blocks (sideways) a entity is able to jump up over a one block gap and up by its automatic step up height
in 1.9 this has been increased to two blocks (shown in v=1VaMGOYdSX8&feature=youtu.be )
For most living entities (inc the player) this can jump up by half a block onto a half slab above,
however for Enderman and Horses this is increased to a whole block (again shown in v=1VaMGOYdSX8&feature=youtu.be )
Summary Table
The following table show how far vertically and horizontaly when pushed by slime blocks (sideways) a mob can move, Horizonally is measured as the air gap inbetween the blocks the entity move from and the block the entity moves to, and vertically is the number of blocks the entity can move upwards above the block the entity was pushed from, NOTE: none of the mobs where jumping at the time of testing (especially the player))
Mob | 1.8 Horizontal | 1.8 Vertical | 1.9+ Horizontal | 1.9+ Vertical |
|---|---|---|---|---|
Player | 1 | 0.5 | 2 | 0.5 |
Villager | 1 | 0.5 | 2 | 0.5 |
Zombie | 1 | 0.5 | 2 | 0.5 |
Skelly | 1 | 0.5 | 2 | 0.5 |
Blaze | 1 | 0.5 | 2 | 0.5 |
Zombie Pigman | 1 | 0.5 | 2 | 0.5 |
Horse | 2 | 1 | 3 | 1 |
Enderman | 1 | 1 | 2 | 1 |
The way to fix this bug would be to disable the automatic step up code whist the entity is falling / not on the ground (like when flying in creative mode)
I'm sorry if this report don't make much sence it's a little hard to explain though 🙂
EDIT
This bug is not a Duplicate of MC-89030 as it can be shown in ' https://youtu.be/Wb0GfHunrRA ' to also affect 1.8.9 which is unaffected by MC-89030
EDIT 2
Added an world where you can automatally test if the bug still affect that version (called 'Bug test World.zip')
EDIT 3
Changed the bug report from only effecting enderman to affecting all living mobs, would like to thank panda for his help suggesting horses as another mob affected by the bug)
Linked issues
is duplicated by 3
relates to 1
Attachments
Comments 26
Part of MC-89030, "pistons warp entities too much".
[Mod] FVbico, MC-89030 only explains part of this not all, of it as there are 2 things which are going on here:
1: the mobs being pushed to far (Explained by MC-89030)
2: Mobs being pushed up a block (Not explained by MC-89030 as 1. the only nearby pistons are sideways facing and 2. the bug also occurs when you lengthen the slime blocks (make the slime blocks 11 long not 2 long) on so no pistons being nearby (badly explained, but this was used in a enderman farm spawn floors so imagine using it there.)
EDIT: Added screenshot
EDIT 2: Changed mc-89030 to MC-89030 so it links to MC-89030 properly
FYI: Due to current issues at work (having to work 60 hours a week and doing a training course for new equipment) , i will be unable to provide frequent updates on this bug report for a while (may be a year or two though) if someone wants to test the bug in the meantime please use the attached bug test world (open the world give the world 30 secs to perform the test and add the version tested with to the affected versions list), i will try to update the major release versions eg. 1.13.0, 1.14.0 ect but i can't make any gurentees.
If 1.13 breaks the command blocks in the bug test world ill try to get them updated, ive already got a working version in the snapshot 18w15a
cant add the affects version tag (nothing showing up in the select tag) but affects mc version 1.17.1
Also Affects 1.9.3 pre 3 (not sure how to add new affects versions) and also this bug didn't happen in 1.8.9 as the enderman fell in the 2 block gap
EDIT: I was later able to reproduce this bug in 1.8.9 so that part of this comment is incorrect