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This is something I hardly can adjust on my side. The iframe has set a with of 100 % and a height of 500 px. So the plugin uses these values to determine the actual aspect ratio. Since 100 % is nothing the CSS aspect-ratio can work with, I determine that the iframe is as wide as the content width of the theme. If that’s not the case, there’s no way for me to detect that.
You can adjust it however to make it look right, using this CSS:
[data-embed-id="oembed_f3719c5be8c2cab32f0b88153aa7b9e8"] {
aspect-ratio: 858/500;
}