When swiping based on a playlist, songs that are already in that playlist get suggested, even if the include previously swiped tracks is disabled

Yea makes sense, but doesnt that kind of defeat the whole purpose of searching for similar songs based on a playlist? Like i want to add more songs similar to the ones already in the playlist to that playlist, meaning I only want to see new songs and not songs already in that playlist. For normal swipes, this behaviour would make sense, but not for swiping based on a playlist in my oppinion. Feel free to correct me if that logic is flawed