Cant place blocks on my back

How to do :
- Sneak
- Then look at the ground
- Place blocks on your back while looking at the ground
- The block will disappear

Need this to be fix for my skyblock

 

Try sneaking and looking at your back then place the block sometimes block disappear because your in the same area as the block

 

Hey I discovered that Im the only one who is experiencing this kind of bug,I think its on my device,I told my friends to do the same but they can place blocks at their back

 

I think this is some kind of anti-cheat in PocketMine. I remember when people in third person mode could hit players that were behind them.

 

Ill try to turn off the anticheat

 

I think that was a client bug that Mojang fixed in later versions.