Bofhtx

I use a command block to summon my favorite horses and I have noticed in 1.16.1 no matter what I adjust the movemvent speed to the horse is the same speed (all of them very slow).  I have a horse spawned from the previous version still in the game and its particle effects have not worn off yet and it is still very fast.  I also tried just summoning horses with a limited command, setting just the speed.  Same problem.

Here's the summon command I am using for my command block:

/summon horse ~ ~1 ~ {SaddleItem:

{id:"minecraft:saddle",Count:1b}

,Variant:768,ArmorItem:{id:"minecraft:diamond_horse_armor",Count:1b},Tame:1,Attributes:[

{Name:generic.maxHealth,Base:9999}

,

{Name:generic.movementSpeed,Base:0.4}

,

{Name:generic.followRange,Base:40}

,

{Name:generic.knockbackResistance,Base:1.0}

,

{Name:generic.armor,Base:30}

],Invulnerable:1,Health:9999.0f,ActiveEffects:[

{Id:8,Amplifier:3.4,Duration:999999,ShowParticles:0}

,

{Id:10,Amplifier:255,Duration:999999,ShowParticles:0}

]}

Also tried this command, with variations to the amplifier number and it appears that changing the speed number has no effect.  

/summon horse ~ ~1 ~ {Variant:1024,Tame:1,SaddleItem:

{id:saddle,Count:1}

,ActiveEffects:[

{Id:1,Amplifier:1,Duration:999999}

]} 

Update 8/18/20:

After going through the list of updates (which I should have done more thoroughly) I see that the attribute commands changed.  However, I will point out I can no longer put together attributes and variants in a single command.  I have to use 2 command blocks now.  1 to apply the variants and 1 to apply the attributes.  Once I worked that out, the horses are fast as expected again.  Will update if they lose this effect.