PaperMC/nms-patches/WorldGenGroundBush.patch

--- a/net/minecraft/server/WorldGenGroundBush.java
+++ b/net/minecraft/server/WorldGenGroundBush.java
@@ -43,7 +43,12 @@
                     }
                 }
             }
+        // CraftBukkit start - Return false if gen was unsuccessful
+        } else {
+            return false;
         }
+        // CraftBukkit end
+
 
         return true;
     }