Blind_pose_roation does not support 1.12.0 models

I was making a custom mob that is a moobloom from minecraft earth and when i made the model out of blockbench and convert it to a minecraft vanilla model i putted the blind_pose_rotation thing on that thing that helps it rotate and when i entered the game all i sre is just a shadow and invisible and when i replace the blind_pose_rotation to rotation the model appears weird but visible could you kindly please fix it