What happens when I edit item.csv
Nothing will happen
I tried this on Minecraft Mac, I changed stick to TRUE
, and I could not place it in the game, nor did there seem to be any glitches.
This could be either due to the fact that items work differently from blocks, or it could be due to the fact that this is a reporting file, not a configuration file, as @hedgehog1029 pointed out in the comments.