Fix custom statistic criteria creation

paper-api/src/main/java/org/bukkit/UnsafeValues.java

@@ -256,4 +256,6 @@ public interface UnsafeValues {
     @Deprecated(since = "1.21.3", forRemoval = true)
     void setBiomeKey(RegionAccessor accessor, int x, int y, int z, NamespacedKey biomeKey);
     // Paper end - namespaced key biome methods
+
+    String getStatisticCriteriaKey(@NotNull org.bukkit.Statistic statistic); // Paper - fix custom stats criteria creation
 }

paper-api/src/main/java/org/bukkit/scoreboard/Criteria.java

@@ -335,7 +335,7 @@ public interface Criteria {
     @NotNull
     public static Criteria statistic(@NotNull Statistic statistic) {
         Preconditions.checkArgument(statistic != null, "statistic must not be null");
-        return Bukkit.getScoreboardCriteria("minecraft.custom:minecraft." + statistic.getKey().getKey());
+        return Bukkit.getScoreboardCriteria(org.bukkit.Bukkit.getUnsafe().getStatisticCriteriaKey(statistic)); // Paper
     }
 
     /**