Parser must use lowercase.

worldedit-core/src/main/java/com/sk89q/worldedit/extension/factory/DefaultBlockParser.java

@@ -253,7 +253,7 @@ class DefaultBlockParser extends InputParser<BlockStateHolder> {
                 blockStates = blockInHand.getStates();
             } else {
                 // Attempt to lookup a block from ID or name.
-                blockType = BlockTypes.get(typeString);
+                blockType = BlockTypes.get(typeString.toLowerCase());
 
                 if (blockType == null) {
                     throw new NoMatchException("Does not match a valid block type: '" + input + "'");

worldedit-core/src/main/java/com/sk89q/worldedit/extension/factory/DefaultItemParser.java

@@ -54,7 +54,7 @@ public class DefaultItemParser extends InputParser<BaseItem> {
 
         if (item == null) {
             item = WorldEdit.getInstance().getPlatformManager()
-                    .queryCapability(Capability.GAME_HOOKS).getRegistries().getItemRegistry().createFromId(input);
+                    .queryCapability(Capability.GAME_HOOKS).getRegistries().getItemRegistry().createFromId(input.toLowerCase());
         }
 
         if (item == null) {