Recalculate chunk height map minimum on load (#4453)

patches/minecraft/net/minecraft/world/chunk/Chunk.java.patch

@@ -300,7 +300,15 @@
              {
                  this.field_76637_e.func_175664_x(blockpos$mutableblockpos);
              }
-@@ -1489,4 +1509,52 @@
+@@ -1420,6 +1440,7 @@
+         else
+         {
+             System.arraycopy(p_177420_1_, 0, this.field_76634_f, 0, this.field_76634_f.length);
++            this.field_82912_p = com.google.common.primitives.Ints.min(this.field_76634_f); // Forge: fix MC-117412
+         }
+     }
+ 
+@@ -1489,4 +1510,52 @@
          QUEUED,
          CHECK;
      }