Drop custom payloads with non-alphanumerical brands

For some reason the client errors only if it contains certain characters, needs further investigation. Mojang changed their string writing implementation, though the actual encoding does not seem to have changed, and this error does not occur anywhere else

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_2to1_20/Protocol1_20_2To1_20.java

@@ -70,6 +70,17 @@ public final class Protocol1_20_2To1_20 extends AbstractProtocol<ClientboundPack
         soundRewriter.register1_19_3Sound(ClientboundPackets1_19_4.SOUND);
         soundRewriter.registerEntitySound(ClientboundPackets1_19_4.ENTITY_SOUND);
 
+        registerClientbound(ClientboundPackets1_19_4.PLUGIN_MESSAGE, wrapper -> {
+            final String channel = wrapper.passthrough(Type.STRING);
+            if (channel.equals("minecraft:brand")) {
+                final String brand = wrapper.passthrough(Type.STRING);
+                // TODO No idea what's going on here
+                if (!brand.matches("[a-zA-Z0-9]+")) {
+                    wrapper.cancel();
+                }
+            }
+        });
+
         registerClientbound(ClientboundPackets1_19_4.RESOURCE_PACK, wrapper -> {
             final String url = wrapper.passthrough(Type.STRING);
             final String hash = wrapper.passthrough(Type.STRING);