Noticed a bit of a bug with the Extractor voiding items. If the inventory it is sending items to (in this case a Furnator from the Powah mod) has a stack of items in it that isn't a max-stack, obviously the extractor will send the items to the inventory. The issue is that the extractor will pull the entire stack of items from the inventory it's connected to, send it to the destination inventory, fill the stack to max, and then void the excess. I assume this is an issue on your end and not Powah's end, but I could be wrong! Let me know if you need any more information!

The intended behaviour is that if a stack of items gets routed to an inventory that only has room for part of the stack, the last tube in the sequence inserts as much of the stack as it can into the inventory, and then find a new destination for the rest of the stack. If there's nowhere else in the network to send the remaining stack, it just drops the remaining stack on the ground.

I'll look into this to make sure this is happening, and look into a fix if it isn't

I figured it would drop based on the behavior I had seen so far, but didn't see any drops anywhere. One thing that could be helpful to know is that the Powah mod's Furnator does have a second inventory slot that only accepts Forge Energy items, so that could explain something (not sure, been a LONG time since I've worked in Forge's code)

Fixed in 1.15.2-1.3.0c