zombie reinforcements do not work since 1.21.1 update

It worked in prior versions but in 1.21.1 it stopped working. It's unknown why it breaks in this version as it's not in the change logs.
This is the command I used to get a zombie that will call reinforcements

/summon minecraft:zombie ~ ~ ~ {Attributes:[{Name:"zombie.spawn_reinforcements",Base:1.0},{Name:"generic.movement_speed",Base:0.0}]}