Happens on only this mapset: beatmapsets/6535#osu/29563 (didn't find any others)

I did some testing, bug appears when screen scaling option is on.

Here are the pictures, if needed more information i'm looking forward for share & fix that:


As seen on pictures, bg dim is not 100%, but settings all the same except screen scaling

It also happens to me, can confirm

Known issue; https://github.com/ppy/osu/issues/22238