An <img> element was lazyloaded with loading=lazy, but had no dimensions specified. Specifying dimensions improves performance

enter image description here

Live Result : here

I'm not sure why I still see this

[Intervention] An element was lazyloaded with loading=lazy, but had no dimensions specified. Specifying dimensions improves performance. See https://crbug.com/954323

I did these already.

<img loading="lazy" src="/assets/fe/img/default.jpg" data-src="{{ $portfolio_image  }}" data-id="{{ $portfolio->id }}" class="portfolio-thumbnail" width="100%" height="100%">

enter image description here

How would one get rid of it ?