I used '--prod --release android' but Google playstore still gives error that apk was signed in debug mode

I’m unable to upload to Google play store. I’m getting the error.

Upload failed
You uploaded an APK or Android App Bundle that was signed in debug mode. You need to sign your APK or Android App Bundle in release mode. [Learn more about signing](http://developer.android.com/tools/publishing/app-signing.html).

I’ve use --prod and --release. I’ve signed manually and done zipalign also. This was working fine until 2 weeks ago.

Please do help. I doubt if there is any Google Play issue. I’ve also put in stackoverflow.