I was exploring a swamp when I found a ton of mushrooms. I needed them so I tried to grab them. I found out that they were ghost blocks. I reloged and it was fixed. I thought it was just a random error but then it happened again. here is a video of it: https://drive.google.com/file/d/1EO_qFfQvWoEb0JPiNsJYahRhIKkJc8ST/view?usp=sharing

Also lag does not have any thing to do with it, I just have a bad laptop.