Mobs face south even with a given rotation value

Command to reproduce by [Mod] Avoma

/summon minecraft:pig ~ ~ ~ {NoAI:1b,Silent:1b,Rotation:[90f,0f]}

so i was making a world that is going to go through every upcoming snapshot as they come, and i was trying to summon a camel with no ai. i then tried to summon another mob with ai facing a certain direction, and it didn't work anyways. i changed the values and checked whether i was using the command right, and i am.

i am using both built in datapacks, not just the one that adds everything (idk what the other one does)