fix: schematic format detection

Author: PierreSchwang

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/BuiltInClipboardFormat.java

@@ -40,7 +40,6 @@
 import org.anarres.parallelgzip.ParallelGZIPOutputStream;
 import org.enginehub.linbus.stream.LinBinaryIO;
 import org.enginehub.linbus.stream.LinReadOptions;
-import org.enginehub.linbus.tree.LinCompoundTag;
 import org.enginehub.linbus.tree.LinRootEntry;
 
 import java.io.BufferedInputStream;
@@ -261,7 +260,11 @@ public boolean isFormat(InputStream inputStream) {
 
         @Override
         public boolean isFormat(File file) {
-            return MCEDIT_SCHEMATIC.isFormat(file);
+            String name = file.getName().toLowerCase(Locale.ROOT);
+            if (!name.endsWith(".schematic") && !name.endsWith(".mcedit") && !name.endsWith(".mce")) {
+                return false;
+            }
+            return super.isFormat(file);
         }
 
         @Override
@@ -272,7 +275,7 @@ public Set<String> getExplicitFileExtensions() {
 
     /**
      * @deprecated Slow, resource intensive, but sometimes safer than using the recommended
-     *         {@link BuiltInClipboardFormat#FAST}.
+     *         {@link BuiltInClipboardFormat#FAST_V2}.
      *         Avoid using with any large schematics/clipboards for reading/writing.
      */
     @Deprecated