okok

build/resources/main/META-INF/accesstransformer.cfg

@@ -0,0 +1,3 @@
+
+public net.minecraft.world.level.levelgen.feature.ScatteredOreFeature <init>(Lcom/mojang/serialization/Codec;)V #constructor
+public-f net.minecraft.world.level.levelgen.feature.TreeFeature m_142674_(Lnet/minecraft/world/level/levelgen/feature/FeaturePlaceContext;)Z #place

build/resources/main/data/custom_ore_gen/forge/biome_modifier/diamondore_biome_modifier.json

@@ -0,0 +1,6 @@
+{
+  "type": "forge:add_features",
+  "biomes": "#minecraft:is_mountain",
+  "features": "custom_ore_gen:diamondore",
+  "step": "top_layer_modification"
+}

build/resources/main/data/custom_ore_gen/forge/biome_modifier/sharddiamondblockore_biome_modifier.json

@@ -4,5 +4,5 @@
     "type": "forge:any"
   },
   "features": "custom_ore_gen:sharddiamondblockore",
-  "step": "top_layer_modification"
+  "step": "underground_ores"
 }

build/resources/main/data/custom_ore_gen/worldgen/configured_feature/diamondore.json

@@ -0,0 +1,27 @@
+{
+  "type": "minecraft:ore",
+  "config": {
+    "size": 9,
+    "discard_chance_on_air_exposure": 0,
+    "targets": [
+      {
+        "target": {
+          "predicate_type": "tag_match",
+          "tag": "stone_ore_replaceables"
+        },
+        "state": {
+          "Name": "minecraft:diamond_ore"
+        }
+      },
+      {
+        "target": {
+          "predicate_type": "tag_match",
+          "tag": "deepslate_ore_replaceables"
+        },
+        "state": {
+          "Name": "minecraft:deepslate_diamond_ore"
+        }
+      }
+    ]
+  }
+}

build/resources/main/data/custom_ore_gen/worldgen/configured_feature/sharddiamondblockore.json

@@ -1,26 +1,13 @@
 {
   "type": "minecraft:ore",
   "config": {
-    "size": 16,
+    "size": 8,
     "discard_chance_on_air_exposure": 0,
     "targets": [
       {
         "target": {
-          "predicate_type": "blockstate_match",
-          "block_state": {
-            "Name": "minecraft:diamond_ore"
-          }
-        },
-        "state": {
-          "Name": "custom_ore_gen:sharddiamondblockore"
-        }
-      },
-      {
-        "target": {
-          "predicate_type": "blockstate_match",
-          "block_state": {
-            "Name": "minecraft:deepslate_diamond_ore"
-          }
+          "predicate_type": "tag_match",
+          "tag": "forge:stone"
         },
         "state": {
           "Name": "custom_ore_gen:sharddiamondblockore"

build/resources/main/data/custom_ore_gen/worldgen/placed_feature/diamondore.json

@@ -0,0 +1,27 @@
+{
+  "feature": "custom_ore_gen:diamondore",
+  "placement": [
+    {
+      "type": "minecraft:count",
+      "count": 10
+    },
+    {
+      "type": "minecraft:in_square"
+    },
+    {
+      "type": "minecraft:height_range",
+      "height": {
+        "type": "minecraft:trapezoid",
+        "min_inclusive": {
+          "absolute": -64
+        },
+        "max_inclusive": {
+          "absolute": 24
+        }
+      }
+    },
+    {
+      "type": "minecraft:biome"
+    }
+  ]
+}

build/resources/main/data/custom_ore_gen/worldgen/placed_feature/sharddiamondblockore.json

@@ -3,7 +3,7 @@
   "placement": [
     {
       "type": "minecraft:count",
-      "count": 20
+      "count": 6
     },
     {
       "type": "minecraft:in_square"