java.lang.IllegalStateException: Unknown invokedynamic bsm: java/lang/runtime/SwitchBootstraps#typeSwitch(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite; (tag=6 iif=false)
at knot//me.modmuss50.optifabric.patcher.MethodComparison.findLambdas(MethodComparison.java:288)
at knot//me.modmuss50.optifabric.patcher.MethodComparison.findHandles(MethodComparison.java:258)
at knot//me.modmuss50.optifabric.patcher.MethodComparison.compare(MethodComparison.java:79)
at knot//me.modmuss50.optifabric.patcher.MethodComparison.(MethodComparison.java:52)
at knot//me.modmuss50.optifabric.patcher.MethodComparison.(MethodComparison.java:44)
at knot//me.modmuss50.optifabric.patcher.LambdaRebuilder.findLambdas(LambdaRebuilder.java:155)
at knot//me.modmuss50.optifabric.patcher.LambdaRebuilder.findLambdas(LambdaRebuilder.java:137)
at knot//me.modmuss50.optifabric.patcher.LambdaRebuilder.findLambdas(LambdaRebuilder.java:114)
at knot//me.modmuss50.optifabric.mod.OptifineSetup$1.apply(OptifineSetup.java:153)
at knot//me.modmuss50.optifabric.util.ZipUtils.transform(ZipUtils.java:165)
at knot//me.modmuss50.optifabric.util.ZipUtils.transform(ZipUtils.java:129)
at knot//me.modmuss50.optifabric.mod.OptifineSetup.getRuntime(OptifineSetup.java:135)
at knot//me.modmuss50.optifabric.mod.OptifabricSetup.run(OptifabricSetup.java:46)
at java.base/java.util.ArrayList.forEach(Unknown Source)
at knot//com.chocohead.mm.Plugin.getMixins(Plugin.java:340)
at org.spongepowered.asm.mixin.transformer.PluginHandle.getMixins(PluginHandle.java:128)
at org.spongepowered.asm.mixin.transformer.MixinConfig.postInitialise(MixinConfig.java:877)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:568)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:462)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:438)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:290)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Unknown Source)
at java.base/java.lang.Class.forName(Unknown Source)
at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:50)
at net.fabricmc.loader.impl.entrypoint.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:124)
at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:53)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:160)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

Optifabric does not have a 1.21+ version. Please close this ticket. If you are still receiving an error AFTER it has been released then please come back and report the error.