Videos are loading but not displayed

Hey there,

currently, I’ve got an issue when visiting video-pages. They are loading in the first moment, but then are not displayed.
They worked until this week. I tested it with a standard theme – its working.
Sadly I didn’t change the theme code in that time.

• `The “nextId” cookie will soon be rejected because it specifies either “None” or an invalid value for the “SameSite” attribute without using the “secure” attribute. For more information on the “SameSite” attribute, see https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite. www-embed-player.js: 255: 444</li>

  <li>The “requests” cookie will soon be rejected because it specifies either “None” or an invalid value for the “SameSite” attribute without using the “secure” attribute. For more information on the “SameSite” attribute, see https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite. www-embed-player.js: 255: 444</li>

  <li>The “SIDCC” cookie will soon be rejected because it specifies either “None” or an invalid value for the “SameSite” attribute without using the “secure” attribute. For more information on the “SameSite” attribute, see https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite. log_event</li>

  <li>The “requests” cookie will soon be rejected because it specifies either “None” or an invalid value for the “SameSite” attribute without using the “secure” attribute. For more information on the “SameSite” attribute, see https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite. www-embed-player.js: 255: 444</li>

  <li>The “SIDCC” cookie will soon be rejected because it specifies either “None” or an invalid value for the “SameSite” attribute without using the “secure” attribute. For more information on the “SameSite” attribute, see https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite. log_event</li>

  <li>The “requests” cookie will soon be rejected because it specifies either “None” or an invalid value for the “SameSite” attribute without using the “secure” attribute. For more information on the “SameSite” attribute, see https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite.`

Hope you can help me fix this!

Best regards

The page I need help with: [log in to see the link]