java - 3D block model for Minecraft works as item but becomes a

I have a block that is a 3d model that's going to be similar to a skull. It renders the model as a item but when I place it it becomes a null block. Originally it was going to be a armor piece but

I was trying to import my blender model into blockbench for the first time but whenever I try to convert it to a java block/item nothing happens it just goes blank

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