I wanted to add an advanced drop from block, but got this error:

Used script: https://pastebin.com/ppD6dqUg
CT log: https://pastebin.com/fgh4YHLi
I also tried WiKi example, but it did not work

You can't use CraftTweaker's Item Bracket in ContentTweaker scripts you need to do item:minecraft:coal

This does not work too. Now this

Also, why Wiki says that I should use IItemStack? https://crafttweaker.readthedocs.io/en/latest/#Mods/ContentTweaker/Vanilla/Advanced_Functionality/Functions/IBlockDropHandler/

Script: https://pastebin.com/KKm0wBWw

Docs are wrong, your script is still wrong. Issues aren't for script support. Please join us in discord.