STABLE version -- 5.1.1130.129

[QZMTCH]

Have you checked its source code?
On my side they haven't started using mask-image yet, they are still using <svg> inside <yt-icon> element.

here Cent Browser (часть 6) and here Cent Browser (часть 6) was the reason https://developer.mozilla.org/en-US/docs...mask-image
at first glance it looks like it’s the same, but no, everything is fine on this site https://www.ivi.ru/watch/odinokij-volk , at first it didn’t show the icon for a second either, but then it did. This is not related to mask image