When you spawn an adult strider with a baby riding it, the adult strider stays stand (Doesn’t do any move) until you use a warped fungus or a leash knot to attract it, but when you attract them with a warped fungus the adult strider doesn´t look directly at you like before, also, when they are stand you can’t move it with your hitbox and the baby strider is always cold.
I expect you could revert as it was before.
The baby strider being cold is intended as per MC-176135 and MC-189383.