There's no universal answer to whether backlog students receive attendance bonuses. Attendance bonuses are determined by individual institutions (colleges, universities, etc.) and even specific programs within those institutions. Some schools might have policies that explicitly exclude students with backlogs from receiving such bonuses, while others may include them depending on whether they've met a certain attendance threshold despite having backlogs.
To find out if a backlog student receives an attendance bonus, you must check the specific rules and regulations of the relevant institution or program. Contact the student affairs office, registrar's office, or department responsible for awarding bonuses.