Blank space when scroll down note.

Blank space when scroll down note.

I reported this issue multiple times with email from last year and  thought it was not solved yet.
I was waiting for fixing it.
But I just found this problem was solved only on firefox  and not on chrome and edge.

Problem: 
1. Hide left folder.
2. Scroll down a note with page down key
3. Blank space is shown on note.