The Bug:
The pick block function used on filled chiseled bookshelves, lit furnaces, lit blast furnaces, and lit smokers doesn't copy their textures.
Steps to Reproduce:
Place down a furnace and begin smelting something in it.
Use the pick block function to copy the NBT data of the furnace.
Place down the furnace you've just received and look closely at its texture.
Take note as to whether or not the pick block function used on filled chiseled bookshelves, lit furnaces, lit blast furnaces, and lit smokers doesn't copy their textures.
Observed Behavior:
The pick block doesn't copy the blocks' textures.
Expected Behavior:
The pick block would copy the blocks' textures.
Confirmed
Although technically there is no active furnace block.