Ghost blocks with hay bale generation in villages placed with /place

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.