i entered nether and when i came back its just showing thats theres 0 slots even when its connected to barrels, like its not connected to anything.

I had this happen with an entire network (probably 30 chests and barrels, plus about 10 modded chests). Now I'm unable to get any network to form if I use cables, even if I just use a single barrel (and minimal connections). If I only use the inventory connector (no cables), I'm fine.

I had just gotten it working, and accidentally created a loop in the network while adding a second terminal. The server crashed (restart brought me to a point a few minutes before), and when I came back I couldn't get it to work at all.

Same here, no clue what happened