You need OptiFine 1.15.2 HD U G6 (or higher version) to make this resource pack work properly.

CMM Alpha_version_0.7 1.15.2 
New:
- snow golem , endermite , Silverfish Model can now walk.

credit code ( twitter: @gorienchis )// thank you so much =w="
https://twitter.com/gorienchis/status/1347513428227735557