On many minecraft servers there is a plugin called ViaBackwards enablign players from older versions to play on the server however with newer items such as the Spear they show up as a sword! This mod fixes it by checking if the item is named:

• "1.21.11 Wooden Spear"
• "1.21.11 Stone Spear"
• "1.21.11 Diamond Spear"
• "1.21.11 Golden Spear"
• "1.21.11 Copper Spear"
• "1.21.11 Iron Spear"
• "1.21.11 Netherite Spear" If so it changes th emodels to a spear and adds spear animations and cooldowns