In the past two days alone, I've gotten over 20 spam calls with none of them leaving a message. Just 3/4 seconds of silence on my voice mail. One call the other day left a 22 second blank message.
Wait, where do I enable this? ๐ฎ
Edit: Found this guide, but Spam & Call Screen isn't available on my 8 pro. So I guess it's only regionally available. :/
Edit 2: Some people online seem to have the same problem. Assigning Phone back as Spam App in the phone settings, clearing the cache and force stopping the Phone app also didn't change anything.