When generating a village using the place command in a flat world (can be any village type), some weird black or faded block appears. Any mob (including player) cannot come to the block and will have some weird shaking. Going to the top will cause the mob (or player) to shake and float. But it is possible to get out of the block by walking backwards. I attached a picture about this weird block.
Environment
Windows 11
Version 21H2
Build no. 22000.652
Java version: currently included version of Java in the launcher.
Seems to be a ghost block. Could you exit the game and enter the world again and see if the issue persists?