At the spot shown in the video two chests regularly spawn in each other. I’ve seen double large chests, double small chests and the large-small combo in the video.
Reproducible (or rather happens on a regular basis when orban glades loot resets)
https://drive.google.com/drive/u/0/folders/1HehaqnuqryuaVb4J8gabMxT7_aRbgHl8
