If turning traffic doesn't enter the bike lane, then it is turning right across the bike lane, which can lead to accidents where a bike collides with a turning vehicle. As such the correct behavior is to signal and enter the bike lane before turning. Of course, many human drivers fail to do this, so it's not surprising that people might be taken aback when they see self driving cars doing it...
If turning traffic doesn't enter the bike lane, then it is turning right across the bike lane, which can lead to accidents where a bike collides with a turning vehicle. As such the correct behavior is to signal and enter the bike lane before turning. Of course, many human drivers fail to do this, so it's not surprising that people might be taken aback when they see self driving cars doing it...