this bug has affected our server from 21w13

https://www.youtube.com/watch?v=NoZLW6x8lvg&t=31s can show the bug

essentially, in some areas in the word, you can power a piston and if you unpower it then update it from the top, it turns into a buggy block that if you stand on you glitch around. Also if you power a piston in the same buggy chunks and break the body, the pistonarm stays as is shown in the video.