beacon bug on Whisper/1.0.3 and Whisper/1.0.4 versions

[siddoff]

when you right-click on the beacon, the server simply crashes with an error:

Encountered an unexpected exception
java.lang.ClassFormatError: Arguments can't fit into locals in class file net/minecraft/class_1704$1
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
at java.lang.ClassLoader.defineClass(ClassLoader.java:1027) ~[?:?]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:160) ~[fabric-loader-0.15.6.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.15.6.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.15.6.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.15.6.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
at net.minecraft.class_1704.(BeaconContainerMixin.java:29) ~[server-intermediary.jar:?]
at net.minecraft.class_2580.createMenu(BeaconTileEntityMixin.java:350) ~[server-intermediary.jar:?]
at net.minecraft.class_3222.method_17355(ServerPlayerMixin_Vanilla.java:1049) ~[server-intermediary.jar:?]
at net.minecraft.class_2238.method_9534(class_2238.java:58) ~[server-intermediary.jar:?]
at net.minecraft.class_4970$class_4971.method_26174(BlockBehaviour_BlockStateBaseMixin.java:1223) ~[server-intermediary.jar:?]
at net.minecraft.class_3225.method_14262(ServerPlayerGameMode_Vanilla.java:841) ~[server-intermediary.jar:?]
at net.minecraft.class_3244.method_12046(ServerPlayNetHandlerMixin.java:1134) ~[server-intermediary.jar:?]
at net.minecraft.class_2885.method_12547(CPlayerTryUseItemOnBlockPacketMixin.java:34) ~[server-intermediary.jar:?]
at net.minecraft.class_2885.method_11054(CPlayerTryUseItemOnBlockPacketMixin.java:8) ~[server-intermediary.jar:?]
at net.minecraft.class_2600.md8db4ee$arclight$lambda$ensureRunningOnSameThread$0$0(PacketThreadUtilMixin.java:535) ~[server-intermediary.jar:?]
at net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
at net.minecraft.class_1255.method_18859(class_1255.java:156) ~[server-intermediary.jar:?]
at net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_24306(MinecraftServerMixin.java:797) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_18859(MinecraftServerMixin.java:165) ~[server-intermediary.jar:?]
at net.minecraft.class_1255.method_16075(class_1255.java:130) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_20415(MinecraftServerMixin.java:779) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_16075(MinecraftServerMixin.java:773) ~[server-intermediary.jar:?]
at net.minecraft.class_1255.method_18857(class_1255.java:139) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_16208(MinecraftServerMixin.java:758) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServerMixin.java:2130) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServerMixin.java:270) ~[server-intermediary.jar:?]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]

what's with mods that this error comes out without