In the brush editor, in the pattern configuration, the patterns thumbnails are messed when scrolling.
To reproduce, scroll down and then up again and the thumbnails that where off screen are messed up.
This is the original list:
And this is the list after scrolling the first 3 rows out of screen:
When clicking on the thumbnails, the correct image is shown.
I’m using Krita 4.0.3, Ubuntu 18.04.