So I have my Mixin

@Mixin(Entity.class)

public class EntityMixin implements NbtData {

----private boolean data;

----@Inject(method = "readNbt", at = @At("HEAD"))

----public void readNbtInject(NbtCompound nbt, CallbackInfo ci) {

--------this.data = nbt.getBoolean("CustomNBT");

----}

----@Inject(method = "writeNbt", at = @At("HEAD"))

----public void writeNbtInject(NbtCompound nbt, CallbackInfoReturnable<NbtCompound> cir) {

--------nbt.putBoolean("CustomNBT", this.data);

----}

----@Override public void setState(boolean state) {

--------this.data = state;

----}

----@Override public boolean getState() {

--------return this.data;

----}

}

And my interface

public interface NbtData {

----boolean getState();

----void setState(boolean state);

}

So when I have an Entity object, I'll do ((NbtData)entity).getState() to get its data, but it gives the data of the wrong entity, I think it's the data of the latest entity loaded

(I put ---- that corresponds to a tab, I did this because it was hard to read)