A Bug That Lets You Go Through Blocks

This Bug Is If You Go Into The New Nether Biomes Its The Blue One If You Stand On Top Of The Blue Grass And Break It You Get A Block The Doesn't Have A Name And It Cant Be Placed Its Invisible But Its Under The Category Nature And If You Have It In Your Hotbar And You Have It In Your Hand And You Break A Block It Brakes For You But Not For Other People And When You Phase Through The Blocks You Start To Suffocate As If The Block Is Still There