Whenever I use the mining gadget a green box appears on my screen. This only happens when I use a shaders pack, more specifically the complementary shaders pack. I was told in the complementary shaders discord that this is happening because the mod might be colliding with optifine's shader pipeline.

Fancy graphics?

What do you mean?

Are you using Fancy Graphics settings? Could you also share what shader pack you are using and if you're using optifine?

It's likely a incomparability between optifine and the way the box is rendered. Or it's because you're using fancy graphics. Sorry but I can't do much here.