TinyMCE errors in WP 4

Before WP4 in TinyMCE in formatselect option had same style as text of this option.
For example, see
https://wordpress.stackexchange.com/questions/128931/tinymce-adding-css-to-format-dropdown

But now, in WP4, option have only same font-size and font-family.
I can not set background color or text color for option of format select.
It always white background and black text. Why?
Where can i change this styles. Example, as link higher of this post, don’t work and don’t show colors and background color.
Please HELP! My clients very angry, when update to WP4… ??