As stated above; there are only plants going into this incinerator but they’re displaying as honeycomb for some reason. I had honeycomb in there then added the plants and made it automatic; maybe it’s because of that?
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Oh, thanks for this report!
I’ve seen it once before, but never again, so I thought the bug was gone.
We’ll look into it 
I had this problem by trying to feed both Wood and Copper from the same Stockpile down the same Hopper into the Furnace. The Hopper would only feed one item until it ran out. When the Wood ran out, Copper moved into the Furnace, but displayed as Wood in the Hopper.
I gave up on this idea and used two Stockpiles each with its own Hopper.
Yeah, I have this use case on the list.
While it was intended that players use 2 stockpiles, I’m planning to change the hoppers so they only take resources when an output slot can take it. That should also make 1-stockpile setups work.