---1-inch nomex honeycomb---

I know I said the core is neutral but it still transfers loads from one side to the other. You really need to satisfy yourself that it is ok with a small test or other?? It likely is ok but you can see that a join like this is somehow a disruption to the honeycomb as the cells will not likely match up like a full 1" thick would be. Foam cores can be bonded without concern.