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MC-121903

Command block minecarts do not save execution cooldown to NBT

Open
5

The bug

Command block minecarts do not execute every tick but instead every 4 ticks. However, their cooldown is not saved to NBT. This means when a world with a command block minecart which is supposed to execute the next tick is closed, it will execute after 4 ticks again after the world is reopened.

How to reproduce

  1. Summon a command block minecart

    /summon command_block_minecart

  2. Inspect its NBT data

    /data get entity @e[type=command_block_minecart,limit=1,sort=nearest]

    → ❌ There is no tag tracking the execution cooldown

Linked issues

is duplicated by 1

relates to 1

Attachments

MC-121903.mp4
 MC-121903.png

Comments 9

Can confirm that timers using command block minecarts fall progressively out of sync with other timers with each successive relog.

Can confirm in 20w48a.

Can confirm in 20w51a.

Can confirm in 21w03a.

Can confirm in 21w05b.

Can confirm in 21w06a.

Can confirm in 21w16a.

Can confirm in 1.17.1. Video attached.

Can confirm in 1.18.2.

marcono1234

(Unassigned)

Confirmed

(Unassigned)

command_block_minecart, nbt

Minecraft 1.12.2, Minecraft 17w45b, 1.16.2, 1.16.4, 20w48a, ..., 21w16a, 1.17.1, 1.18.2, 1.20.6, 1.21 Pre-Release 1

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