fix: players being invisible

proxy/src/main/java/com/velocitypowered/proxy/tablist/KeyedVelocityTabList.java

@@ -187,7 +187,7 @@ public class KeyedVelocityTabList implements InternalTabList {
             Set.of(action),
             Collections.unmodifiableList(entries)
         )
-    ).thenAcceptAsync(event -> {
+    ).thenAccept(event -> {
       if (event.getResult().isAllowed()) {
         if (event.getResult().getIds().isEmpty()) {
           boolean rewrite = false;
@@ -242,7 +242,7 @@ public class KeyedVelocityTabList implements InternalTabList {
           }
         }
       }
-    });
+    }).join();
   }
 
   protected ServerUpdateTabListEvent.@Nullable Action mapToEventAction(int action) {

proxy/src/main/java/com/velocitypowered/proxy/tablist/VelocityTabList.java

@@ -225,7 +225,7 @@ public class VelocityTabList implements InternalTabList {
     proxyServer.getEventManager().fire(new ServerUpdateTabListEvent(player,
         Collections.unmodifiableSet(mapToEventActions(infoPacket.getActions())),
         Collections.unmodifiableList(entries))
-    ).thenAcceptAsync(event -> {
+    ).thenAccept(event -> {
       if (event.getResult().isAllowed()) {
         if (event.getResult().getIds().isEmpty()) {
           boolean rewrite = false;
@@ -258,7 +258,7 @@ public class VelocityTabList implements InternalTabList {
           }
         }
       }
-    });
+    }).join();
   }
 
   protected UpsertPlayerInfoPacket.Entry createRawEntry(VelocityTabListEntry entry) {
@@ -456,7 +456,7 @@ public class VelocityTabList implements InternalTabList {
             Set.of(ServerUpdateTabListEvent.Action.REMOVE_PLAYER),
             Collections.unmodifiableList(entries)
         )
-    ).thenAcceptAsync(event -> {
+    ).thenAccept(event -> {
       if (event.getResult().isAllowed()) {
         if (event.getResult().getIds().isEmpty()) {
           for (UUID uuid : infoPacket.getProfilesToRemove()) {
@@ -476,6 +476,6 @@ public class VelocityTabList implements InternalTabList {
           this.connection.write(new RemovePlayerInfoPacket(uuids));
         }
       }
-    });
+    }).join();
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/tablist/VelocityTabListLegacy.java

@@ -96,7 +96,7 @@ public class VelocityTabListLegacy extends KeyedVelocityTabList {
             Set.of(action),
             Collections.singletonList(entry)
         )
-    ).thenAcceptAsync(event -> {
+    ).thenAccept(event -> {
       if (event.getResult().isAllowed()) {
         if (event.getResult().getIds().isEmpty()) {
           if (entry.isRewrite()) {
@@ -134,7 +134,7 @@ public class VelocityTabListLegacy extends KeyedVelocityTabList {
           }
         }
       }
-    });
+    }).join();
   }
 
   private UpdateEventTabListEntry mapToEventEntry(int action, LegacyPlayerListItemPacket.Item packetItem) {