Blocks containing multiple blocks, like turtle eggs, sea pickles, and candles, are not accounted for in the materials list. For example, a schematic containing a block with four candles (the block in question if refferred to by the game as minecraft:candle[candles=4]) registers as only one candle in the materials list. I will note that this does not apply to double slabs.

All of these need to be added to an override list type thing, and I haven't remembered to keep up with it in the recent MC versions.

Fix in #568.