Using procedures to damage tools can't break them. This is a problem, because I am making a mod which uses a writing table, and I added an 'Ink Bottle' tool which runs down on durability as you use it. However, when it reaches 0 durability, it doesn't break, instead carrying on taking damage into the negatives. I don't know if this is explicitly an Mcreator issue, but you could still change the block to break the item if it reaches or surpasses 0. This issue means that the deal damage to item block doesn't do much, and has little purpose.