Any ideas how to fix? Only some animations flickering like this.

Make sure your read value's are up-to-date , If this doesnt work , it might be the model your using , or the anim definitions of the npc.

	private void readValues(Stream stream) {
		while(true) {
			int i = stream.readUnsignedByte();
			if (i == 0) {
				return;
			}
			if (i == 1) {
				modelId = stream.readUnsignedWord();
			} else if (i == 2) {
				anInt406 = stream.readUnsignedWord();
				if (AnimationDefinition.anims != null) {
					aAnimation_407 = AnimationDefinition.anims[anInt406];
				}
			} else if (i == 4) {
				anInt410 = stream.readUnsignedWord();
			} else if (i == 5) {
				anInt411 = stream.readUnsignedWord();
			} else if (i == 6) {
				anInt412 = stream.readUnsignedWord();
			} else if (i == 7) {
				anInt413 = stream.readUnsignedWord();
			} else if (i == 8) {
				anInt414 = stream.readUnsignedWord();
			} else if (i == 40) {
				int j = stream.readUnsignedByte();
				for (int k = 0; k < j; k++) {
					anIntArray408[k] = stream.readUnsignedWord();
					anIntArray409[k] = stream.readUnsignedWord();
				}
			} else {
				System.out.println("Error unrecognised spotanim config code: " + i);
			}
		}
	}