Bug on creative and survival

You may not move X/Z when floating if you are not sneaking

Description:
sneaking to the "nothing" (edge) will make you to stay floating. if you go to a corner you can see that you gte standing in an invisible block. You can't fall even if flying, becuse when you sneak and go down you will be limted. 
You will stay next to the block (0). You will stand next to the block behind in Column (A) if you destroy block (0).
You can put blocks below (column B) You cannot put more blocks in column (A) from where you are standing (beside, in the column B)

Example:


May not put blocks--X Ƴ-You (steve)
          Column A--▄ ▄--Column B
                    ▄ ▄
                    ▄ ▄

unless you jump and right click to place a block above Column (A) or Column (B). when digging down in Column (B), you reach the limit when you go 
to the same level of the last block in Column (A).
bug will keep even if you completely destroy all colums without mooving in X/Z angles. Bug disappear when mooving in X/Z angles. when column A is 
made of blocks afected by gravity and you destroy blocks below, you will get a block lower. As much as you destroy, as lower is the level you are standing 
in Column (B). Fixes when jumping (you go to one by one to the last block in column (A) position).
When Column (A) start with a torch, then above is a solid block and above it is a big column of a block/s afected by gravity, yo may not destroy Solid block, 
or you will fall as if you were above the block/s afected by gravity.

Example:


  Ƴ-You (steve)
0 ▄--sand
1 ▄--sand
2 ▄--sand
3 ▄--sand   If sand blocks fall above a torch, it will turn them into items
4 ▄--sand
5 ▄--sand
6 ▄--sand
7 ▄--sand
8 ▄--sand
9 ▄--sand
  ͏͏ --Dirt   If destroyed, Sand will fall
 i--torch 
 ˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉ
If solid block (dirt) is destroyed, Steve will fall to the end and all sand blcoks will turn into items. (he will take damage) 

    Steeve
   /
 iƳ--torch 
 ˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉ 

 If you destroy any sand block under the last one in the colum A you will get like this. 
No blocks can be placed in the top of colum A
  
  X--(no block can be placed) (only if forced with pistons)
0 ▄Ƴ-You (steve)
1 ▄--sand
2 ▄--sand
3 ▄--sand
4 ▄--sand
5 ▄--sand   If sand blocks fall above a torch, it will turn them into items
6 ▄--sand
7 ▄--sand
8 ▄--sand
  ͏͏ --Dirt   If destroyed, Sand will fall
 i--torch  (not necesary for the example)
 ˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉ 
If another block is destroyed, you will get another level down like this
  V--Block can be placed
0 ▄--sand 
1 ▄Ƴ-You (steve)
2 ▄--sand 
3 ▄--sand
4 ▄--sand
5 ▄--sand   If sand blocks fall above a torch, it will turn them into items
6 ▄--sand
7 ▄--sand
8 ▄--sand
  ͏͏ --Dirt   If destroyed, Sand will fall
 i--torch  (not necesary for the example)
 ˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉ 


If in level 1: 

you can't Jump when there's a block over Block (A)

--Water Column A:
  *If sneaking: water will just push you a bit. Bug will keep
  *If standed : water will push you and you will fall down; water will stop you from taking damage.
  *Can put blocks

--Water Column B:
 +When water block is placed above you: Nothing. Bug just keeps.
 +When water block is deleted from above:
   *If sneaking: water will just push you a bit. Bug will keep
   *If standed : water will push you and you will fall down; water will stop you from taking damage.
   *Can put blocks

If in level 2:
A block can be placed above Block (0) but then Steve won't be able to jump. Again, bug is fixed when moving X/Z and

--Water Column A:
  *If sneaking: water will not push you. Bug will keep
  *If standed : water will not push you. Bug will keep
  *Can put blocks

--Water Column B:
 +When water block is placed above you: Nothing. Bug just keeps.
 +When water block is deleted from above:
   *If sneaking: water will just push you a bit. Bug will keep
   *If standed : water will push you and you will fall down; water will stop you from taking damage.
   *Can put blocks

PD: If a block falls from above and hit you, you get unbugged.
PD: You won't be able to bypass the bug even if you fly.