Why is there a black youtube preview in safari on ios?

Question

YouTube

The essence of the problem on the site (wordpress), videos from YouTube are posted / embedded, when you open the page on Android, the preview is all in color, everything is fine. When opening on apple devices, in half of the cases everything is also fine, in half of the cases instead of a preview, a black screen, with an icon (standard red YouTube) play, is played without problems, but the black screen is wildly annoying. The cache was reset, no results, where to dig?