[1.16.4] How to render item from tile entity like chest ?

Hello i can't render some item from my tile entity from my NonNullList<ItemStack> i don't know this problem happent from what please look my code or try run it.

https://github.com/thepdone/de

Note : When you put your item you want exit from your world to main menu and return to your world it will success render

I'm need just render it when put my item don't need exit from my world and join my world agian for render it.

Update : I'm forget this block DM is decoration tab when you put it right click that block transparent and pick some item and exit to main menu then and try get your world agian.

Edited January 1, 20214 yr by zlappedx3