Google ads campaign Stoped working After updating the app

Hi,

After Updating the Android game with new unity version and google sdks our Google ads campaign tROAS stopped working.
I also changed the target age if app form 3+(for kids) to 13+(non kids). We did that because for kids game have much higher ads failure rate.
After the update the Goolge sdks are working properly. Firebase is getting event logs Properly.

I updated app with the below Unity and sdk version->
Unity Version : 2022.3.47f1
Unity Google Mobile Ads SDK : 9.2.0 , Unity Firebase SDK : 12.2.1

Before update the versions were->
Unity Version : 2021.3.29f1
Unity Google Mobile Ads SDK : 8.5.2 , Unity Firebase SDK : 11.6.0

Google ads campaign tROAS is connected with the firebase to get the Conversions(installs) data.
but if flat lined after the update. we stopped getting Conversions.

I also did update for other game with latest google sdks.
That game is built on cocos2dx but it did not seems to have those issues with Google ads campaign tROAS.

I contacted Google ads for the issue they told the issue is not on their side the issue is with firebase.
After contacting firebase support they replied with below

" after investigation, I found that the “in_app_purchase” event has a high number of Unattributed Pings. It indicates SDK implementation issues.
Considering the details mentioned above, the issue at hand highly likely revolves around potential problems in the “Firebase SDK implementation Event stopped getting pings”.
Please make sure you have included the AdSupport framework. Otherwise, SDK conversion tracking will not work. "

But we do not have Inapp purchase in our app and we don’t have any event logs related to in_app_purchase in Firebase.

After that i updated the app with downgrading the google sdk versions below.
Unity Version : 2022.3.47f1
Unity Google Mobile Ads SDK : 9.0.0 , Unity Firebase SDK : 12.0.0

but the issue still remains.

Game with issue →

Any suggestions appreciated.

Thanks