fix antigravel and upward falling blocks

common-1.21.1/src/main/resources/data/antarchy/worldgen/density_function/thoraxis_underside_density.json

@@ -8,7 +8,7 @@
       "argument1": {
         "type": "minecraft:y_clamped_gradient",
         "from_y": -256,
-        "to_y": -16,
+        "to_y": -1,
         "from_value": -2.0,
         "to_value": 1.05
       },

common-1.21.1/src/main/resources/data/antarchy/worldgen/noise_settings/thoraxis.json

@@ -74,7 +74,7 @@
                       "from_value": 0.0,
                       "from_y": -8,
                       "to_value": 1.0,
-                      "to_y": 24
+                      "to_y": 4
                     },
                     "argument2": -2.5
                   },
@@ -150,7 +150,7 @@
               "type": "minecraft:y_above",
               "add_stone_depth": false,
               "anchor": {
-                "absolute": 4
+                "absolute": 1
               },
               "surface_depth_multiplier": 0
             }