Probleme to the weather icon remains white while another color is assigned

Hello,

There is a problem on the color of the icon weather on the small preview on the web site and preview the mobile application.
The weather icon remains white while another color is assigned.
I used the default weather icon on the edit page :

The small preview on the web site : here

The big preview on the web site : here

Can you fix this problem?
Thank you,

This happens to every imported graphics that has a color assigned - not only weather icons. :frowning: