The block I made renders perfectly when placed, but while in the inventory or dropped as an item it has no texture/model. I have already made several similar blocks using the same method which work fine, it's just this one. Script is below, if that helps.

#loader contenttweaker

import mods.contenttweaker.VanillaFactory;
import mods.contenttweaker.Block;
import mods.contenttweaker.AxisAlignedBB;

var basin = VanillaFactory.createBlock("unfired_basin", blockmaterial:clay);
basin.setAxisAlignedBB(AxisAlignedBB.create(0.0625d, 0.0d, 0.0625d, 0.9375d, 0.25d, 0.9375d));
basin.setBlockSoundType(soundtype:Ground);
basin.setFullBlock(false);
basin.setBlockHardness(2.0);
basin.setLightOpacity(0);
basin.register();

var pot = VanillaFactory.createBlock("unfired_pot", blockmaterial:clay);
pot.setAxisAlignedBB(AxisAlignedBB.create(0.125d, 0.0d, 0.125d, 0.875d, 0.8125, 0.875d));
pot.setBlockSoundType(soundtype:Ground);
pot.setFullBlock(false);
pot.setBlockHardness(2.0);
pot.setLightOpacity(0);
pot.register();

var crucible = VanillaFactory.createBlock("unfired_crucible", blockmaterial:clay);
crucible.setAxisAlignedBB(AxisAlignedBB.create(0.0625d, 0.0d, 0.0625d, 0.9375d, 0.9375d, 0.9375d));
crucible.setBlockSoundType(soundtype:Ground);
crucible.setFullBlock(false);
crucible.setBlockHardness(2.0);
crucible.setLightOpacity(0);
crucible.register();

That'd be a model issue, not a contenttweaker one.

Good to know, thank you for the quick reply and have a good day:)