Improve the performance of accessing ThreadedBlockData.

src/main/java/com/gtnewhorizons/angelica/client/rendering/ThreadedBlockData.java

@@ -21,6 +21,7 @@ public ThreadedBlockData(ThreadedBlockData other) {
     }
 
     public static ThreadedBlockData get(Block block) {
+        if (block == null) return null; // Now, null can be passed in `CeleritasBlockTransform`.
         return ((Getter)block).angelica$getThreadData();
     }
 

src/main/java/com/gtnewhorizons/angelica/loading/fml/transformers/CeleritasBlockTransformer.java

@@ -41,7 +41,7 @@ public byte[] transform(String name, String transformedName, byte[] basicClass)
         cr.accept(cn, 0);
         final boolean changed = inner.transformClassNode(transformedName, cn);
         if (changed) {
-            final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
+            final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
             cn.accept(cw);
             final byte[] bytes = cw.toByteArray();
             AngelicaClassDump.dumpClass(transformedName, basicClass, bytes, this);

src/main/java/com/gtnewhorizons/angelica/loading/rfb/transformers/RFBCeleritasBlockTransformer.java

@@ -64,6 +64,7 @@ public void transformClass(@NotNull ExtensibleClassLoader classLoader, @NotNull
         final boolean changed = inner.transformClassNode(className, classNode.getNode());
         if (changed) {
             classNode.computeMaxs();
+            classNode.computeFrames();
             AngelicaClassDump.dumpRFBClass(className, classNode, this);
         }
     }