I was playing on skyblock and noticed that if you place storage of any kind with hopper upgrade at lowest level facing into the void your game just crashes

Could you share the crash log?

Link to crash log:

https://mclo.gs/Sr1ndp5

Also happened to me today on a server. I've placed a chest at the lowest level in the end and slotted an advanced hopper upgrade into it, and right after that the server crashed, and whenever I joined it crashed again. I tried to reproduce it in singleplayer in overworld, but it didn't lead to a crash, so it might be that it only affects servers

https://pastebin.com/04pxYgB6 relevant crash log
I bet it's because the upgrade tries to access a block outside of world boundaries (so I guess the same happens when you place a container with a hopper upgrade at the highest point of the world)

This is fixed in the latest versions