Set the maxStack

src/main/kotlin/me/shedaniel/architect/plugin/TransformExpect.kt

@@ -61,6 +61,7 @@ fun transformExpectPlatform(): (ClassNode, (String, ByteArray) -> Unit) -> Class
                 )
 
                 method.instructions.addReturn(returnValue.first { it != '[' })
+                method.maxStack = index
             }
         }
 

src/main/kotlin/me/shedaniel/architect/plugin/utils/Transform.kt

@@ -26,7 +26,7 @@ object Transform {
             if ((reader.access and Opcodes.ACC_MODULE) == 0) {
                 val node = ClassNode(Opcodes.ASM8)
                 reader.accept(node, ClassReader.EXPAND_FRAMES)
-                val writer = ClassWriter(ClassWriter.COMPUTE_MAXS)
+                val writer = ClassWriter(0)
                 transform(node) { name, bytes ->
                     File(output.toFile().parentFile, "$name.class").also {
                         it.delete()