After you press on the Reset button from the top right, the color code is changed, but the color from the field remains unchanged

Steps to reproduce:

1. Click on Administer Wiki
2. Click on Presentation
3. Click on the default theme
4. Click Edit
5. (E.g.) Fill in the Menu Gradient Color
6. Do not close the edit color picker
7. Click on the Reset button from the top right

When press on the Reset button, the color code is changed, but the color from the field remains unchanged until you press on that field.