Fix duplicate mystery box config fields

app/Http/Controllers/Admin/GameConfigController.php

@@ -66,6 +66,23 @@ class GameConfigController extends Controller
         $current = $gameConfig->params ?? [];
         $updated = array_merge($current, $request->input('params'));
 
+        if ($gameConfig->game_key === 'mystery_box') {
+            $legacyMap = [
+                'min_reward' => 'normal_reward_min',
+                'max_reward' => 'normal_reward_max',
+                'rare_min_reward' => 'rare_reward_min',
+                'rare_max_reward' => 'rare_reward_max',
+            ];
+
+            foreach ($legacyMap as $legacyKey => $newKey) {
+                if (! array_key_exists($newKey, $updated) && array_key_exists($legacyKey, $updated)) {
+                    $updated[$newKey] = $updated[$legacyKey];
+                }
+
+                unset($updated[$legacyKey]);
+            }
+        }
+
         $gameConfig->update(['params' => $updated]);
         $gameConfig->clearCache();