delaying of carpet startup due to extensions not loaded

src/main/java/carpet/mixins/Main_clientCoreMixin.java

@@ -10,7 +10,10 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 @Mixin(Main.class)
 public class Main_clientCoreMixin
 {
-    @Inject(method = "main", at = @At("HEAD"))
+    @Inject(method = "main", at = @At( // little bit later giving extensions time to react an join the train
+            value = "INVOKE",
+            target = "Ljoptsimple/OptionParser;parse([Ljava/lang/String;)Ljoptsimple/OptionSet;")
+    )
     private static void onServerStarted(String[] args, CallbackInfo ci)
     {
         CarpetServer.onGameStarted();

src/main/java/carpet/mixins/Main_serverCoreMixin.java

@@ -10,7 +10,10 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 @Mixin(Main.class)
 public class Main_serverCoreMixin
 {
-    @Inject(method = "main", at = @At("HEAD"))
+    @Inject(method = "main", at = @At( // little bit later than main to add chance for extensions to register.
+            value = "INVOKE",
+            target = "Ljoptsimple/OptionParser;parse([Ljava/lang/String;)Ljoptsimple/OptionSet;")
+    )
     private static void onServerStarted(String[] args, CallbackInfo ci)
     {
         CarpetServer.onGameStarted();