这可能是由于缓存问题导致的，可以尝试清除Google Play Store应用程序的缓存和数据。如果清除缓存和数据后仍然存在问题，则可以尝试以下步骤：

1. 确保您已将所有产品ID正确设置，并且已设置正确的开发人员帐户以进行测试。

private val skuList = listOf("product_id_1", "product_id_2")
val params = SkuDetailsParams.newBuilder()
    .setType(BillingClient.SkuType.INAPP)
    .setSkusList(skuList)
    .build()
billingClient.querySkuDetailsAsync(params) { billingResult, skuDetailsList ->
    // Handle the result
}

2. 确保您已连接到Google服务，并且已成功启动BillingClient。

private lateinit var billingClient: BillingClient

override fun onPurchasesUpdated(billingResult: BillingResult, purchases: MutableList?) {
    // Handle the result
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    billingClient = BillingClient.newBuilder(this)
        .setListener(this)
        .enablePendingPurchases()
        .build()
    billingClient.startConnection(object : BillingClientStateListener {
        override fun onBillingSetupFinished(billingResult: BillingResult) {
            // Handle the result
        }

        override fun onBillingServiceDisconnected() {}
    })
}

3. 确保您已正确处理所有错误。

override fun onBillingSetupFinished(billingResult: BillingResult) {
    if (billingResult.responseCode == BillingClient.BillingResponseCode.OK) {
        // The billing client is connected successfully
    } else {
        // Handle the error
    }
}

4. 确保您正确处理所有购买。

override fun onPurchasesUpdated(billingResult: BillingResult, purchases: MutableList?) {
    if (billingResult.responseCode == BillingClient.BillingResponseCode.OK 
            && purchases != null) {
        for (purchase in purchases) {
            if (purchase.purchaseState == Purchase.PurchaseState.PURCHASED) {
                // Handle the completed purchase