Hello.
As copper ingot is a vanilla item, Copper shield can be enabled without any other mods. But after enabling copper, amethyst and quartz shields (vanilla resources) only copper shield is missing texture. Other shields displays correctly. No texture in craft, in create tab, in inventory and in hand. Tried version 1.4.0 and 1.4.1 on Minecraft 1.20.1
When apply a banner to Copper shield it displays in inventory but still is black in hand.
By the way, is it possible to move crafting receipt to a second tab in crafting table like all weapons and iron shield? Now they are in 4th tab and it's strange.

Problem was simple - missed lines

     {
        "type": "single",
        "resource": "basicshields:entity/copper_shield_base"
      },
      {
        "type": "single",
        "resource": "basicshields:entity/copper_shield_base_nopattern"
      },

in assets\minecraft\atlases\blocks.json

Please, don't forget add this in future release