Railcraft: Minecarts of various types randomly disappearing

[iambob314]

(Possibly related to #433.)

At least three times now, in two separate areas, a portion of a Railcraft-linked train has vanished without a trace. The first two times only the locomotive disappeared, while the third time the locomotive and some vanilla minecarts-with-chest also disappeared.

In the first two cases, the train's route was fully chunkloaded, but the chunkloaders may have run out. In the third case, the train included a world anchor cart, which did not run out (the world anchor cart was not among the vanishing carts). In all cases, there was no physical damage to the area (i.e., no creeper explosions, etc.)

Unfortunately, we don't have much more information yet; I'll update this issue if we learn more.

[CovertJaguar]

There are known duplication/vanishing issues with vanilla entity handling that have existed for as long as Railcraft has. No one has been able to identify the root cause of the issue, only that is affects all moving entities and only occurs when a chunk unloads/loads.

[liach]

This looks like an issue with NBT serialization.

[Georggi]

If it is going to be resolved, is it possible to release 1.7.10 version of this?

[liach]

not likely

[liach]

Try disabling dormant chunk cache.

[CovertJaguar]

This issue existed before the dormant chunk cache existed, its been around since the earliest days of Railcraft. The original Forge PR may have fixed the entity issues, but I'm pretty sure the new one they decided to use won't.

[liach]

https://github.com/MinecraftForge/MinecraftForge/issues/1642
There has been a forge ticket on this long ago, but it was pretty much ignored.

[liach]

Also, see
https://bugs.mojang.com/browse/MC-12194
http://www.minecraftforum.net/forums/minecraft-java-edition/survival-mode/2621802-minecarts-disappearing-in-1-8

[liach]

I guess MinecraftForge/MinecraftForge#5160 might handle that.

[aikar]

@liach yes 5160 will greatly help with lots of entity disappearance/rollback issues.

[liach]

Thanks @aikar :heart: Turns out bukkit/spigot can actually help mods instead of "bringing conflicts!" because of your effort!

[Generalcamo]

The PR was merged in, this needs testing with the latest Forge Versions that include this PR

[CovertJaguar]

Closing until we receive a positive report that this still happens.