Hello, I am a server owner that has experienced this bug many times and I can tell you that this issue is common in my server and is not that harmful other than looking bad. Also, there is a way to get rid of it. It is affected by gravity. Going into creative and destroying all blocks to bedrock(then replacing the blocks if you so choose) will remove the glitch from the world.
Josey Wales Medley
Hello, I am a server owner that has experienced this bug many times and I can tell you that this issue is common in my server and is not that harmful other than looking bad. Also, there is a way to get rid of it. It is affected by gravity. Going into creative and destroying all blocks to bedrock(then replacing the blocks if you so choose) will remove the glitch from the world.