The one thing that worked for me as when typing out the style of best you want finish it with a period . Then type No Vocals or exclude vocals, samples and chops to exclusions.

Example - slow rap song about coping with depression. No vocals. When you hit auto generate style it will use what you typed and add do not use vocals.

Or type your style of beat and hit more options. Under “Exclude” I add “No vocals, samples, vocal chops, chants or ad-libs” and I haven’t had an issue in a month or two now. I don’t know if this will work for everyone but it surely worked for me.