World icon doesn't update until window is resized

The bug

The world icon doesn't update until the window is resized.

How to reproduce

1. Reset a world icon
2. Enter the world
3. Wait a few seconds to generate the icon
4. Save and Quit to Title
5. Open Singleplayer -> the world icon doesn't show the correct icon
6. Resize the window -> the world now has the correct icon

Example

See attachment