Industrial Foregoing Version: 1.9.2-170
TeslaCoreLib Version: 1.0.14

1. Place a BHC.
2. Place a BHU, put two stacks in it, break BHU.
3. Put BHU in BHC.
4. Note that the BHU now has 64 items and the corresponding output slot in the BHC has 64 items.
5. Lock the BHC inventory.
6. Remove one stack from the BHC output slot.
7. Note that the BHU is now empty and has no NBT data restricting it to a specific item yet the BHC is still locked to the particular item.
8. Note that you cannot pump that item into the BHC in this state.

Possible solution: BHU should keep configuration while in BHC even if empty, only clearing configuration when empty and removed from BHC.