Put the summary of the bug you're having here
i made a chest then I deposited all my stuff into it and immediately saved and exited it when i came back onto my world the chest had gone i then double checked that i did put all my stuff into the chest and i had so i lost everything that i had put into it. i could also place blocks where it used to be and it was not invisible

What I expected to happen was...: all my stuff to still be in the chest

Describe what you thought should happen here
open world -chest still be there with my stuff in like normal
What actually happened was...: chest not there not invisable stuff gone not still in inventory

Describe what happened here
as stated above

Steps to Reproduce:
1... make a chest put items into the chest
2. ...immediately save an exit
3. ... open world to see if chest is still there or not

Note. it was a very very big world save earth by letslent 3.3GB big also the heigh was about Y.220 not sure if the height had anything to do with it.
also i was also using optifine but its happened without it aswell.