Prevent SecretRule from picking invalid presets (#27456)

* Prevent SecretRule from picking invalid presets

* remove lonely semicolon

---------

Co-authored-by: Nemanja <98561806+EmoGarbage404@users.noreply.github.com>

Content.Server/GameTicking/GameTicker.RoundFlow.cs

@@ -173,6 +173,26 @@ namespace Content.Server.GameTicking
             return gridUids;
         }
 
+        public int ReadyPlayerCount()
+        {
+            var total = 0;
+            foreach (var (userId, status) in _playerGameStatuses)
+            {
+                if (LobbyEnabled && status == PlayerGameStatus.NotReadyToPlay)
+                    continue;
+
+                if (!_playerManager.TryGetSessionById(userId, out _))
+                    continue;
+
+                if (_banManager.GetRoleBans(userId) == null)
+                    continue;
+
+                total++;
+            }
+
+            return total;
+        }
+
         public void StartRound(bool force = false)
         {
 #if EXCEPTION_TOLERANCE
@@ -228,6 +248,8 @@ namespace Content.Server.GameTicking
                 readyPlayerProfiles.Add(userId, profile);
             }
 
+            DebugTools.AssertEqual(readyPlayers.Count, ReadyPlayerCount());
+
             // Just in case it hasn't been loaded previously we'll try loading it.
             LoadMaps();