BUG: YouTube now requires referrerpolicy="strict-origin-when-cross-origin" attribute on embedded video iframes for proper playback.

Changes needed in renderYoutube() and renderYoutubeNoCookie() methods:
Add: el.setAttribute('referrerpolicy', 'strict-origin-when-cross-origin');
After: el.setAttribute('allowfullscreen', 'true');

If it is necessary to execute some code to reproduce the bug, paste it below:

--- a/packages/core/src/dom_components/view/ComponentVideoView.ts
+++ b/packages/core/src/dom_components/view/ComponentVideoView.ts
@@ -105,6 +105,7 @@ export default class ComponentVideoView extends ComponentImageView<ComponentVide
     el.src = this.model.getYoutubeSrc();
     el.frameBorder = '0';
     el.setAttribute('allowfullscreen', 'true');
+    el.setAttribute('referrerpolicy', 'strict-origin-when-cross-origin');
     this.initVideoEl(el);
     return el;
   }
@@ -113,6 +114,7 @@ export default class ComponentVideoView extends ComponentImageView<ComponentVide
     var el = document.createElement('iframe');
     el.src = this.model.getYoutubeNoCookieSrc();
     el.frameBorder = '0';
     el.setAttribute('allowfullscreen', 'true');
+    el.setAttribute('referrerpolicy', 'strict-origin-when-cross-origin');
     this.initVideoEl(el);
     return el;
   }

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