Hey there,
I was on my world casually and I thought about making a mob tower/trap, so I started digging out some land (since I was in a forest biome) and started digging straight through a hill with my diamond shovel with an enchantment unbreaking iii , I came out the other side and found that there was some floating grass where the block and been dug up but the grass stayed.
If it changes anything I have installed toomanyitems mod. And no other mods

I am very sorry for wasting your time but Minecraft froze so I saved and quit to title and went back to my world and the floating grass was gone!!??
I was just about to screenshot the grass but was too late

With the picture I attached the floating grass was floating next to the block where the cross is.

I haven’t experienced any bugs before but have seen some chunk and lighting glitches, i think you should try and fix those if you could but that would probably lag the game.

With awesomeness,
George warner (egroeg9)