These links send referral header to Google Analytics:

• https link, one page redirect, with utm params https://mixkit.co/art/?utm_source=dave-referral-https
• https link, no redirect https://mixkit.co/free-stock-art/
• https link, no redirects https://elements.envato.com/

These links DO NOT send referral headers to Google Analytics (http -> https redirect)

• http link with utm param http://mixkit.co/art/?utm_source=dave-referral-http
• http link with no utm params http://mixkit.co/art
• http link http://mixkit.co/free-stock-art/
• http link, http://elements.envato.com/

HTTPS links show the referrer field (as seen in GA debug extension):

However HTTP links do not show this referrer field, as that is lost in the http -> https redirect.