Already found a beatmap with a problematic storyboard.
http://osu.ppy.sh/s/11558
The background displays in widescreen even though the storyboard elements remain letterboxed, resulting in the background being visible on the sides of the screen. The issue seems to only occur on the "deadbeat's Hard" difficulty, while the others are letterboxed correctly.
I've included a screenshot of the issue below.
http://osu.ppy.sh/s/11558
The background displays in widescreen even though the storyboard elements remain letterboxed, resulting in the background being visible on the sides of the screen. The issue seems to only occur on the "deadbeat's Hard" difficulty, while the others are letterboxed correctly.
I've included a screenshot of the issue below.