Fix nms environments for nether and end

src/main/java/com/volmit/iris/nms/v16_2/NMSBinding16_2.java

@@ -40,4 +40,9 @@ public class NMSBinding16_2 implements INMSBinding
 		baseBiomeCache.put(biome, v);
 		return v;
 	}
+
+	@Override
+	public boolean isBukkit() {
+		return false;
+	}
 }

src/main/java/com/volmit/iris/nms/v16_3/NMSBinding16_3.java

@@ -39,4 +39,9 @@ public class NMSBinding16_3 implements INMSBinding
 		baseBiomeCache.put(biome, v);
 		return v;
 	}
+
+	@Override
+	public boolean isBukkit() {
+		return false;
+	}
 }

src/main/java/com/volmit/iris/nms/v1X/NMSBinding1X.java

@@ -25,4 +25,9 @@ public class NMSBinding1X implements INMSBinding
 	public Object getBiomeBase(Object registry, Biome biome) {
 		return null;
 	}
+
+	@Override
+	public boolean isBukkit() {
+		return true;
+	}
 }