Hi everyone ! I started to make a mod with forge recently, and tried to make a garbage mod to be comfortable with forge before making an actual mod, and I'm slowly making more and more things. I made a new log (and wood) type, to which i added tags like "logs_that_burn" to the Block and the BlockItem, as well as WOOD material during registration.
I registered it like this for the wood block (I have a similar function for the log block but the problem is the same) :

public static final RegistryObject<Block> RED_TULGEY_WOOD = BLOCKS.register("red_tulgey_wood", () -> new RotatedPillarBlock(AbstractBlock.Properties.of(Material.WOOD, MaterialColor.TERRACOTTA_RED).strength(2.0F).sound(SoundType.WOOD)));

BLOCKS being a DeferredRegistry of Blocks

So i saw that Minecraft was using a setFlammable function in the FireBlock class to register flammable blocks, and i also saw it used in other mods source code like Biome O Plenty's one.

But this function is private. I cannot register any flammable block using setFlammable and i don't know how to do make the game understand that my block can burn. Cause right now the fire acts like if it was a stone block, the fire just sits here and eventually disappears without destroying the block, and the fire doesn't propagate. I thought that setting the Material to WOOD would be enough. I don't think i should extends AbstractFlamableBlock and just copy and paste the FireBlock class as it wouldn't be the vanilla FireBlock anymore right ? It could create conflicts with other mods ?

Thank you very much, this now works just as expected !