diff --git a/src/services/worldStateService.ts b/src/services/worldStateService.ts
index 747f5ec1..6eb9482d 100644
--- a/src/services/worldStateService.ts
+++ b/src/services/worldStateService.ts
@@ -1493,6 +1493,8 @@ const nightwaveTagToSeason: Record<string, number> = {
     RadioLegionSyndicate: 0 // The Wolf of Saturn Six
 };
 
+type AnyObj = { [key: string]: object | Array<object> | string | number | boolean };
+const staticWorldStateBackup: AnyObj = structuredClone(staticWorldState);
 let syncWorldStateTimer: NodeJS.Timeout | null = null;
 
 export const syncWorldState = async (): Promise<void> => {
@@ -1528,7 +1530,6 @@ export const syncWorldState = async (): Promise<void> => {
         logger.error("Invalid world state sync response", { data });
         return;
     }
-    type AnyObj = { [key: string]: object | Array<object> | string | number | boolean };
     const staticWorldState_ = staticWorldState as AnyObj;
     const data_ = data as AnyObj;
 
@@ -1547,9 +1548,9 @@ export const syncWorldState = async (): Promise<void> => {
                 case "Events":
                     {
                         const remoteValue = data_[name] as Array<object>;
-                        const localValue = staticWorldState_[name] as Array<object>;
+                        const localValue = staticWorldStateBackup[name] as Array<object>;
                         if (Array.isArray(remoteValue) && Array.isArray(localValue)) {
-                            localValue.push(...remoteValue);
+                            staticWorldState_[name] = localValue.concat(remoteValue);
                         }
                     }
                     break;