Do not allow Vexes to load chunks

paper-server/patches/sources/net/minecraft/world/entity/monster/Vex.java.patch

@@ -1,6 +1,18 @@
 --- a/net/minecraft/world/entity/monster/Vex.java
 +++ b/net/minecraft/world/entity/monster/Vex.java
-@@ -381,7 +381,7 @@
+@@ -354,7 +354,10 @@
+             for (int i = 0; i < 3; ++i) {
+                 BlockPos blockposition1 = blockposition.offset(Vex.this.random.nextInt(15) - 7, Vex.this.random.nextInt(11) - 5, Vex.this.random.nextInt(15) - 7);
+ 
+-                if (Vex.this.level().isEmptyBlock(blockposition1)) {
++                // Paper start - Don't load chunks
++                final net.minecraft.world.level.block.state.BlockState blockState = Vex.this.level().getBlockStateIfLoaded(blockposition1);
++                if (blockState != null && blockState.isAir()) {
++                    // Paper end - Don't load chunks
+                     Vex.this.moveControl.setWantedPosition((double) blockposition1.getX() + 0.5D, (double) blockposition1.getY() + 0.5D, (double) blockposition1.getZ() + 0.5D, 0.25D);
+                     if (Vex.this.getTarget() == null) {
+                         Vex.this.getLookControl().setLookAt((double) blockposition1.getX() + 0.5D, (double) blockposition1.getY() + 0.5D, (double) blockposition1.getZ() + 0.5D, 180.0F, 20.0F);
+@@ -381,7 +384,7 @@
  
          @Override
          public void start() {