Interesting
Happens To Me (I Have A Render Distance Of 12 Chunks But Simulation Distance Is 6 Chunks) But As Soon As I Reload My World It Gets Fixed
It Happens To Me But Only Occasionally.
You Might Of Died But Even Then They Don't Despawn So I Doj't Know
Do You Have A Good Internet??
If So You Should Have A Stable/Fast/High Connection
Also There Might Be A Problem With Your Switch/Router
Be Sure That There Are 0 Issues With Your Switch/Router
It Doesn't On My Device
Not Resolved,Pistons Still Don't Retract Blocks