I have never used the beta either. My version of the dialer: 23.0 (com.android.dialer)
In my case, since some weeks the type of spam calls I receive are those that always change their numbers, I do not have a spam number that has ever called me back after the first time.
Nonetheless I can provide a number which I have just manually blocked and marked as spam: 966001578 (complete with country code would be +34966001578), reported at 23h50m, on 29thJine 2026. (Will report this Inna separate thread)
I was expecting that the list of spam number for my country (Spain) had already a numbers in it, based on some contents from the block Community. Was I wrong to expect this?