[BUG] Horse,donkey,alpaca disence calculation error and terrain processing error.

[wazxdecChina]

Prerequisites

• I made sure I am running the latest development build
• I tried to look for similar issues before opening a new one
• I have set debugmessages=true in config to diagnose my issue
• I have redacted session tokens and passwords before attaching screenshots

Minecraft Version

None

Console Client Version

Lasted

Expected Behavior

I hope that rideable creatures in Minecraft can be normal processing in MCC and when MCC processes some blocks MCC can be normal processing

Actual Behavior

When I using flying machines in Minecraft,I found something wrong in MCC.It is found in 1.20.1.
Firstly I tried to let the player stand on the honey block so that the player can move with this flying machine,but the player can't move with it in MCC.In Minecraft honey block can stick entities who were on top of it,but player in MCC it not works.then I got a donkey,I ride it to my flying machine and let the player ride the donkey.There's a saddle on the donkey.I start the machine,then the player and the donkey were...flying???They were flying at the sky.I toke off the saddle,but it maked a new problem.Maybe because of the donkey wasn't controlled by player,the player followed the machine to move.I used "/entity near Donkey list" in MCC,the dicense of the donkey and the player got bigger and bigger,the dicense in MCC seems like the dicense of starting point and the location of the donkey.However,in Minecraft 1.12.2 dosen't has this problem,but there's new problem in it.Because of there's no honey block in 1.12.2,so I surrounded the player with slime blocks.However Wnen I Transmit the player into the hole which made by smile blocks but the player "fly" on the smile block.I place a redstone block under the player,the player finally standed on the block as normal.But when I start the machine the player pass through the slime block and fell down.May the terrain processing occurr an error?In Minecraft the player will move follow the machine.

Steps to Reproduce the bug

1. In Minecraft 1.20.1,I made a flying mechine like this:

In MCC I used command "/entity near Donkey list",got log like this:

2026-01-15 11:42:39 实体: 14
[MCC] Type: 驴
[MCC] 姿势: Standing
[MCC] 生命值: §a53§8
[MCC] 距离: 0.06
[MCC] 位置: X:-14.74, Y:-46.06, Z:19.82

2. Then I started this mechine,the donkey and the player moved with this mechine:

In MCC I used command "/entity near Donkey list" again,got log like this:

2026-01-15 11:43:08 实体: 14
[MCC] Type: 驴
[MCC] 姿势: Standing
[MCC] 生命值: §a53§8
[MCC] 距离: 31.23
[MCC] 位置: X:-14.6, Y:-46, Z:47.74

3. Finally I started it again:

In MCC I used command "/entity near Donkey list" when it moving,got log like this:

2026-01-15 11:43:21 实体: 14
[MCC] Type: 驴
[MCC] 姿势: Standing
[MCC] 生命值: §a53§8
[MCC] 距离: 22.1
[MCC] 位置: X:-14.52, Y:-46, Z:36.92

4. I killed the donkey ,and let the player stand on the top of honey block,then I started the mechine,but the player fell down.

The player will move with the mechine when the player stand on the top of the honey block.

5. Then I mounted the saddle and started the mechine,The player and the horse were flying:

6. In Minecraft 1.12.2,I made the same mechine:

In MCC I used command "/entity near Donkey list",got log like this:

2026-01-15 12:05:23 实体: 987
[MCC] Type: 马
[MCC] 姿势: Standing
[MCC] 生命值: §a20§8
[MCC] 距离: 10.45
[MCC] 位置: X:768.5, Y:14.14, Z:852.49

There seems like something wrong with distance calculation.When I start the mechine,the result didn't change.

7. When I transmited the player to the top of smile block,it seems that MCC can't handle the terrain correctly.The player fly onto the smile block.

8. I placed a redstone under the player,like this:

However,the player pass through the smile block and fell down.

If the player stand on the redstone block the player will move with it.

Attach screenshot here (If applicable)

I felt sorry that I can't give you the screenshot about MCC here.But I can give you logs about MCC,although there is nothing important in logs.

console-log-1.20.1.txt

console-log-1.12.2.txt

Anythings that could help diagnosing the bug

look up

Device

Desktop

Operating System

Windows

Server Address (If applicable)

None

[wazxdecChina]

Additionally,when I tried to push the player or attect the player,the player won't move.It just like this player turn on the velocity,in some server it may be deemed as cheating.It may be related to this bug.