Added config option to skip VV config state packet queue

Fixes join issues on <= 1.20.1 fabric/quilt servers

src/main/java/net/raphimc/viaproxy/injection/mixins/MixinProtocol1_20To1_20_2.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of ViaProxy - https://github.com/RaphiMC/ViaProxy
+ * Copyright (C) 2021-2025 RK_01/RaphiMC and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package net.raphimc.viaproxy.injection.mixins;
+
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.protocols.v1_19_3to1_19_4.packet.ServerboundPackets1_19_4;
+import com.viaversion.viaversion.protocols.v1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viaversion.protocols.v1_20to1_20_2.packet.ServerboundPackets1_20_2;
+import net.raphimc.viaproxy.ViaProxy;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(value = Protocol1_20To1_20_2.class, remap = false)
+public abstract class MixinProtocol1_20To1_20_2 {
+
+    @Inject(method = "lambda$queueServerboundPacket$12", at = @At("HEAD"), cancellable = true)
+    private static void dontQueueConfigPackets(ServerboundPackets1_20_2 packetType, PacketWrapper wrapper, CallbackInfo ci) {
+        if (ViaProxy.getConfig().shouldSkipConfigStatePacketQueue()) {
+            ci.cancel();
+            switch (packetType) {
+                case CUSTOM_PAYLOAD -> wrapper.setPacketType(ServerboundPackets1_19_4.CUSTOM_PAYLOAD);
+                case KEEP_ALIVE -> wrapper.setPacketType(ServerboundPackets1_19_4.KEEP_ALIVE);
+                case PONG -> wrapper.setPacketType(ServerboundPackets1_19_4.PONG);
+                default -> throw new IllegalStateException("Unexpected packet type: " + packetType);
+            }
+        }
+    }
+
+}

src/main/java/net/raphimc/viaproxy/protocoltranslator/viaproxy/ViaProxyConfig.java

@@ -190,6 +190,13 @@ public class ViaProxyConfig {
     })
     private boolean workAroundConfigStatePacketQueue = false;
 
+    @Option("skip-config-state-packet-queue")
+    @Description({
+            "Fixes potential join issues on <= 1.20.1 quilt/fabric servers.",
+            "It's recommended to only enable this if you are experiencing issues with the config state packet queue (See above issue)."
+    })
+    private boolean skipConfigStatePacketQueue = false;
+
     @Option("send-connection-details")
     @Description({
             "If enabled, ViaProxy will send a connection details custom payload packet to the server.",
@@ -501,6 +508,15 @@ public class ViaProxyConfig {
         this.save();
     }
 
+    public boolean shouldSkipConfigStatePacketQueue() {
+        return this.skipConfigStatePacketQueue;
+    }
+
+    public void setSkipConfigStatePacketQueue(final boolean skipConfigStatePacketQueue) {
+        this.skipConfigStatePacketQueue = skipConfigStatePacketQueue;
+        this.save();
+    }
+
     public boolean shouldSendConnectionDetails() {
         return this.sendConnectionDetails;
     }