Zombie horses and camel husks float in water

Observed behavior:

Zombie horses and camel husks float in water in 25w46a.

Expected behavior:

Zombie horses and camel husks should sink like other undead mobs.

Attached are two screenshots. In 1.21.10, skeleton and zombie horses sink. In 25w46a, the skeleton horse still sinks but the zombie horse and camel husk float.