Blocks lose there hit box you can pass right through them when you get to the center you start to suffocate but you can only walk on them any where else you can go right through. I found out that some blocks become ghost blocks and It may happen when in laggy places like I was in a place where I put all my farms which causes a lot of lag. The blocks don't go in visible you don't know if that block is a ghost block or not. They are not "ghost blocks" I called it that because they are visible but you can not touch, like that lilpad glitch from java edition. Steps to cause this.
1. have a really laggy area. (The more the lag the better)
2. reload chunk you can do this my leaving the game and open it or leave the area and come back
3. jump and try to hit your head on a ceiling (You should go right through) or walk in a place will 1 block off the ground.
If this does not work then try again this may happen randomly or when you keast expect it. But all the steps still apply. Also This has nothing to do with the creeper totem.
Breaking news this bug is with multible people https://m.youtube.com/watch?v=UBaF77aIWJ0 this person goes over some bugs thanks to him the first one he goes over is my bug im so happy! turns out I was wrong its not from lag but maybe some of my information can help.