SQL programming problem, test case failed

Topic content
problem ： Calculation 2021 The completion rate of each video recorded in the year ( The result is three decimal places ), And sort them in descending order according to the completion rate

notes ： Video completion rate refers to the proportion of completed playback times to the total playback times . Simplicity , The difference between the end viewing time and the start playing time >= Video duration , It is deemed to have finished playing .
user - Video interactive table tb_user_video_log

Short video message table tb_video_info

Here is my code , No problem outputting use cases , But the test case fails , The test case fails all the time

SELECT
video_id,
round(avg(CASE WHEN SECOND(TIMEDIFF(end_time, start_time)) >= duration THEN 1
ELSE 0
END),3) avg_comp_play_rate
FROM
tb_user_video_log
JOIN
tb_video_info USING (video_id)
WHERE
YEAR(start_time) = 2021 and YEAR(end_time) = 2021
GROUP BY video_id
ORDER BY avg_comp_play_rate DESC;