Fix #1490

worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/blocks/CharSetBlocks.java

@@ -97,7 +97,6 @@ public class CharSetBlocks extends CharBlocks implements IChunkSet {
     @Override
     public boolean setBiome(int x, int y, int z, BiomeType biome) {
         updateSectionIndexRange(y >> 4);
-        y -= minSectionPosition << 4;
         int layer = (y >> 4) - minSectionPosition;
         if (biomes == null) {
             biomes = new BiomeType[sectionCount][];

worldedit-core/src/main/java/com/sk89q/worldedit/command/BiomeCommands.java

@@ -193,7 +193,7 @@ public class BiomeCommands {
 
         player.print(Caption.of(
                 "worldedit.setbiome.changed",
-                TextComponent.of(visitor.getAffected())
+                TextComponent.of(visitor.getAffected() / (editSession.getMaxY() - editSession.getMinY()))
         ));
     }