The bug
Apparently, horse breeding causes the child to inherit the final value of the parents' speed attributes, instead of the base value. As a result, parents with the speed potion effect produce offspring that are naturally faster than both. This process can be repeated indefinitely.
This is an active exploit that can be used in survival to obtain arbitrarily fast horses.
Note that this bug does not occur with jump boost due to MCPE-45823.
How to reproduce
1. Spawn two horses in an enclosed area
2. Tame them
3. /effect @e[type=horse] speed 500 10 true
4. Breed them
5. Feed the baby to adulthood, and ride it
→ ❌ It's ridiculously fast
Linked issues
is duplicated by 2
Comments 9
This could possibly be used to lag servers. If you give 2 horses speed 255 and breed them, tame the baby, and give the baby speed 255, it is so fast you get lagged back.
Why would you report this? I know it can be abused, but it can also be a really good thing. Any mode of transportation is better than just walking. Honestly, a better fix for this would be to keep it in the game, but impose a cap to prevent players from spawning two horses with Speed 255 and breed them. Like, have it only work if the horses were splashed with a low-level Speed potion, or something similar
Hey,I have a question. After this is fixed, if I breed two superspeed horses I got before 1.19.70, will the baby still be a superspeed horse, or will it be normal? So if I already have two superspeed horses, could I potentially still make an army of superspeed horses in 1.19.70?
In relation to this bug, it should be kept in mind that normal breeding of horses over multiple generations cannot increase average horse attributes (MC-16533, which applies as well to Bedrock Edition). So although this bug makes horse breeding broken in one way, horse breeding is broken in another without it. The expected behavior is that a long-term investment of time and effort in breeding would have some payoff that makes it worth doing (i.e. the game would reflect a moral universe where you get a fair reward for an honest day's work). The observered behavior in a broader view is that players with an interest in breeding horses are stuck with a choice between "cheating" to breed absurdly overpowered horses, or just breeding mediocre horses.