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Thanks. It works.

I want to create a mod that implements a new type of rails, but how do I remove the collision for the rails? Vanilla Minecraft rails have disabled collisions so you can walk through them, but my rails currently have a collision just like one layer of snow on the ground does. I have checked the AbstractRailBlock and RailBlock classes of Forge but I couldn't find anything. Overriding the method getCollisionBoundingBoxFromPool and returning null doesn't work either because it doesn't exist anymore. Does anyone have an idea of how to do this?

That's what the containerItem thing I mentioned is for. It leaves an item in the crafting table after being crafted, which is what they seem to want. It's also used for other things, like potion bottles and water buckets.

Try jarfix again

Does it work if you remove Optifine?

You're trying to run 1.14.4 Optifine in 1.15.2, this isn't going to work.

A workaround for what I am trying to do (replace the vanilla item) is just give it the same registry name. Works perfectly.