Minecarts sometimes appear off the track

Version 1.4.6 - Minecart moving in clockwise direction appears off track at about the 6:00 position and returns to the track at about the 12:00 position.

Related to MC-4057? It's also a problem with minecarts turning...

No, unrelated. This is about carts appearing off the track while still being ON them.

You are correct Anon Ymus - in my example the minecart is still "on the track" because it keeps going around.

This seems to happen when a (storage?)minecart is moving while one is quitting the game (SSP).

The minecart is being displayed at (x,y,z-1) when being at (x,y,z).
Illumination is being computed referring to (x,y,z-1) (i.e. gets black when moving next to a solid blocks).
Apart from that the cart follows the rail quite normally: The interaction with turns, acceleration tracks, and sensor tracks is normal.

no its just a normal minecart

Just seen this happened in 1.5.1 pre while testing [MC-1692|MC-1692].

Wanted to report it, but anyway, let me further explain what is going on here.

This is a Minecraft Server bug in the net.minecraft.server.EntityTrackerEntry class.
It contains a method that creates a spawn packet for the tracked Entity.
This spawn packet uses the 'live' entity coordinates, NOT the ones that are known and synchronized to the other players.
As a result, relative movement packets are sent later on which invalidate that 'too new' spawn message.

This issue occurs for the VehicleSpawnMessage, MobSpawnMessage and possibly others, too. It can be fixed by using the SYNCHRONIZED x/y/z/yaw/pitch values from the EntityTrackerEntry in the spawn message, instead of the 'live' coordinates of the Entity.

The live coordinates are used in the new(Entity) constructor of the packets.

A routine 'absolute update' is sent every 400 ticks/20 secs (I believe) and fixes this mismatch in that time frame. This makes this bug somewhat bearable.

For minecarts, this issue lies deeper with also issues in curves where it derails for a split second. This has to do with entity movement interpolation and is hard to fix.

Is this still a concern in the current Minecraft version 1.6.2 / Launcher version 1.2.1 ? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

il test it now its not really that much of a problem anyway

These show the minecart bug.

confirmed to still be there. i dont really mind it.

I have gotten another picture for this, and this is still happening in 1.7.2 I think this could be useful for redstone perhaps. Also, I wasn't on a server when I got this photo, it was singleplayer, I have already reported this. (sorry, I didn't know to look 😉

Yes, I'm having this issue too but ti seems to only happen when you load a world and fixes itself after a few minutes.

Couldn't reproduce for 1.13.1.                                                                           

Second opinion?

Shown to still exist in this video (at 1:15:36), which I'd say is sufficient evidence that this still exists (even though they're using optifine) when combined with the lack of any protocol changes regarding entity motion.

Seems to affect 19w38b, can I request ownership?

Affects 19w39a

Affects 19w40a

Confirmed in 1.16 Pre-release 2.

possibly related: cart went UNDER the rails in 1/.16 RC1 (see attached screenshots)

Affects 1.16.1

In 20w29a.

Relates to MC-9157 and MC-158169

Can confirm in 20w51a.

Can confirm in 21w03a.

Can confirm in 21w05b.

I can confirm in 21w07a.

Can confirm in 21w11a. Relates to MC-2714.

its only visual

Can confirm in 1.17.1. Happens especially with unloading and re-loading chunks, even more often with low render distances.

Can confirm in 23w06a and 1.19.3

Experiencing repeatedly (very, very repeatedly) in 1.20.6.  Not just visual, also catches on mobs and other carts.  While in motion, passes through most (but not all?) solid blocks unobstructed, will also float adjacent to the track it's allegedly on.  Also causes incorrect interactions with powered rails and detector rails; carts will sometimes not be detected.  The glitch is currently making it extremely difficult to use Minecarts in the game.

This might be a duplicate of MC-170907 and fixed now in 1.21 Pre-Release 1

1.21 Pre-Release 2: when reloading the chunks, if one minecart unit (of for example 10 minecarts), some minecarts might bug into each other. This is as if one minecart is moving, but with a way darker shadow.

From my testing and observation this past week, this seems to be fixed with the experimental minecarts from 24w33a. I will be adding the 'experimental_minecarts_fixed' tag, please feel free to remove it if a new case comes up proving that this is not fixed yet.

As an example, here is a tick sprint with minecarts on powered rails:

Previously, the minecarts would have cut around the corners going over blocks off of the rails, this no longer occurs.