Recently faced this issue and contacted Google Play Developer Support. Here are the instructions. Maybe it could help someone...
Please make sure that the tester email you used must not be opted into
multiple testing tracks. Please ensure that your testing group is only
enabled in only one testing track.
I recommend you to opt out of all the testing tracks and clear the
cache and data for the Play Store app and your device’s download
manager. This will clear any settings and temporary information saved
to your device. You can still access purchases you’ve made from Google
Play, like apps, music, movies, and books. Here's how:
- Open your device's main Settings app.
- Tap Apps or Application manager (depending on your device, this may be different).
- Tap Google Play Store
- Tap Storage.
- Tap CLEAR CACHE > OK.
- Tap CLEAR DATA > OK.
- Tap the back arrow to go back to the main menu.
- Select Downloads or Download Manager.
- Tap CLEAR CACHE > OK.
- Tap CLEAR DATA > OK.
- Relaunch the app.
IMHO, the most crucial point here is the following:
Please make sure that the tester email you used must not be opted into multiple testing tracks. Please ensure that your testing group is only enabled in only one testing track.