nether planks couldn't burning ,but the sticks which nether planks crafted can burning
two nether planks should crafting "nether stick"or crafting a stick with a tag
Steps to Reproduce:
1. Crafting sticks with nether planks
2. Place a furnace
3. Put in the thing you want to burn and the sticks
tips:I think it's more a bug than a feature suggestion.Because of it’s no logic with that the nether planks can't be burned but the sticks which are crafted by them can be burn.But I suggestion that add "nether stick" or a new tag could be seen as suggestions.However,it's only can be used to sovle the problem.