SG Optimizer removes css preload

Hi all,

I want to preload 2 CSS-files because Google Page Speed Insights tells me to do it. I added these two lines to the header of my theme:
<link rel=”preload” href=”https://www.eventfex.com/wp-content/themes/directory2/design/css/alert.css&#8221; as=”style” />
<link rel=”preload” href=”https://www.eventfex.com/wp-content/themes/directory2/design/css/reset.css&#8221; as=”style” />

But SG Optimizer removes the 2 lines when I acitivate the option “combine css files”. I think it moves the code to the combined css file, right? What can I do that this does not happen?

Thank you for your help!
Best,
Manfred

The page I need help with: [log in to see the link]