If i copy of blueprint a chest then it immidiately starts with all slots filterd out (all orange so that no items can go inside) and it stops all production with said items. Also it happens to all chests being copied. Also it affects mod Unichest for some reason.

High probability incompatible with other Linked Chest.
You can remove the Unichest, and then see if it will happen

Tried without Unichest - still a problem. I place 1 chest and it has immidiately everything in orange (filtered out). I take out the filter and just use pipette to ghost it and place a copy - everything is immidiately filtered again. Right click on existing chest copies everythhing and clears the filter (becuase it just changes the ID of a chest) but copying blocks all slots.... No linked chest or anything except for your mod,

The 0 ID linked chest will be always filtered. You can use lift top gui to chose the item, then the Chest ID will be changed to other ID.
in other ways the chest ID that less than 10000 will be always filtered too.

so that makes it incompatible with Unichest and Smart linked chest....... Well i guess you shouldn't need them together anyway...

next version will change this. Only the 0 ID linked chest will be filtered.

Thanks!