You're most likely logged into a managed account (e.g. a work email). It doesn't matter if you have your personal account active in Play Store. The Play Store consistently checks all accounts that you're signed into on that phone. If any of them are managed by an enterprise that it resets the referrer token. You can verify this by removing said account and retry sending the token.
I can't speak to *why* this is the intended behavior but perhaps someone from Google can shine some light.

You're most likely logged into a managed account (e.g. a work email). It doesn't matter if you have your personal account active in Play Store. The Play Store consistently checks all accounts that you're signed into on that phone. If any of them are managed by an enterprise that it resets the referrer token. You can verify this by removing said account and retry sending the token.
I can't speak to *why* this is the intended behavior but perhaps someone from Google can shine some light.