On https://oko.press/ , the page content fails to load unless the web inspector is open when loading the page. The page may continue to work if the web inspector is closed after the page finishes loading. This is tested on WebKitGTK 2.40.0, Gnome Web 44.0
Just for the record: it works as expected with current main: 9bc4d3cabf88ab50f1258bcd7bc3b07bbe5596b5