I wouldn't go saying that TE3 isn't stable yet as it may be encountering a corner case within the configs of AgS. The knapsack could be a newer version of TiC conflicting with an old save style of the knapsack.
I'd expect an answer for this will be found fairly quickly as the TE3 issues seem to be semi-common at the moment within AgS. Specifically for itemducts they generally only get stuffed if the grid of itemducts is far too large and the input conduits calculations lag behind the real time storage calculations because of travel distance. From what I can tell itemducts do not calculate en route but instead calculate upon entering the itemduct grid. The best fixes for that is proper routing, decrease the size of the item duct grid, separate the grid into sub-grids, always having a "default route"(Somewhere any overflow items can be sent, trashcan or otherwise), and using impulse itemducts.
There are specific case issues like previously with crucibles who always "appeared" to be empty when itemducts checked the inventory so they would constantly send cobble to them creating stuffing issues. There may be other inventories like this so if you see large numbers of stuffed items mark down the block they're trying to be sent into and report it to the bugs thread or ask about it otherwise.
I'd expect an answer for this will be found fairly quickly as the TE3 issues seem to be semi-common at the moment within AgS. Specifically for itemducts they generally only get stuffed if the grid of itemducts is far too large and the input conduits calculations lag behind the real time storage calculations because of travel distance. From what I can tell itemducts do not calculate en route but instead calculate upon entering the itemduct grid. The best fixes for that is proper routing, decrease the size of the item duct grid, separate the grid into sub-grids, always having a "default route"(Somewhere any overflow items can be sent, trashcan or otherwise), and using impulse itemducts.
There are specific case issues like previously with crucibles who always "appeared" to be empty when itemducts checked the inventory so they would constantly send cobble to them creating stuffing issues. There may be other inventories like this so if you see large numbers of stuffed items mark down the block they're trying to be sent into and report it to the bugs thread or ask about it otherwise.