对新创建的文档使用 Get() 时 Firestore 规则失败

在新创建的文档上使用 Firestore 规则中的 get() 会导致返回值为 false。如果您等待几秒钟并命中在同一个新文档上调用 get() 的安全规则，则 get() 将返回预期值。我是否在规则和/或代码中遗漏了某些内容，或者这是 Firestore 的错误？

service cloud.firestore {
  match /databases/{database}/documents {

    match /budgets/{budgetId} {

      allow read: if resource.data.userId == request.auth.uid;
      allow create: if request.auth.uid == request.resource.data.userId;

      match /accounts/{accountId} {
        allow read, create, update: if userOwnsBudget();  // <--- failing for newly created budget documents
      }

      function userOwnsBudget() {
        return get(/databases/$(database)/documents/budgets/$(budgetId)).data.userId == request.auth.uid;
      }
    }
  }
}

const data: Budget = {
    userId: userId,
    budgetName: budgetName,
    currencyType: currencyType
};

try {
    const newBudget = await this.afs.collection<Budget>('budgets').add(data);

    const accountsCollection: AngularFirestoreCollection<BudgetAccount> = this.afs.collection<BudgetAccount>('budgets/' + newBudget.id + '/accounts');

    //Insufficient permission, but occasionally succeeds 
    accountsCollection.valueChanges().subscribe(accounts => {
        console.log(accounts);
    });

    setTimeout(() => {
        accountsCollection.valueChanges().subscribe(accounts => {
            console.log(accounts)
        });
    }, someArbitaryTime) // Typically waiting 5 seconds is enough, but occasionally that will still fail 

} catch(error) {
    console.error(error);
}

编辑：此错误已得到解决。

不幸的是，这是目前的一个已知问题。我们正在努力修复，一旦解决，将在此处更新。谢谢并抱歉！