You have to add .defaultBlockState and COPY the block. Here an example:
public static final RegistryObject<Block> CUSTOM_STAIRS = BLOCKS.register("custom_stairs", () ->
new StairBlock(CUSTOM_PLANKS.get().defaultBlockState(), BlockBehaviour.Properties.copy(MANGROVE_PLANKS.get()).strength(0.3F, 0.3F))
Tried several varations of the path:
Writing out the full path like Luis said above
Including and excluding "textures/"
Including and excluding the file extension
Nothing seems to be working. No error for anything either. Probably the biggest clue so far.
I'm looking for a server Minecraft Manhunt but 1 human vs 4 monsters, the human spawn with nothing and have some free time to get stuff before monsters spawn and he have to beat the game by killing the ender dragon, does anyone knows a server like that?