[Mac] Username and password fields are invisible on instagram login page

That text inputs are invisible on instagram login page. Actually, they have a color of background and there should be white rectangle around them. But background rectangle is invisible, so user can't find that inputs.
Same thing happens on MacOS version of Firefox and Safari, but there are placeholders. WebView doesn't have placeholder text either.

Reproducible: always
Platform-specific: yes, macos only, works fine on Linux.
Regression: no (looks like depends on macos version)
Steps to reproduce: open http://instagram.com in webview (simple browser attached).


RULE "sites/instagram.com" any any