Hey, 

Im playing on the newest snaphot 20w17a and wanted to build an Enderman farm.

Placed shulkerboxes and Enderchest and they seem to just dissappear?!

First my shulkerboxes dissappeared when I left the End to get some stuff and then returned and then the same happened to my enderchest after that.

I tested it 2 times now and it happened again.

I recorded it on a video but cant upload it here cuz the file is too big.

Feel free to contact me for the video, if thats possible ( Im new to this forum thingy and dont know whats possible here + Im german, so my english might not be the best)