You should add fallback to the webp img tag. In the attached link are some strategies, most relevant is this:
<picture>
<source srcset="img/awesomeWebPImage.webp" type="image/webp">
<source srcset="img/creakyOldJPEG.jpg" type="image/jpeg">
<img src="img/creakyOldJPEG.jpg" alt="Alt Text!">
</picture>
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