In the validation settings for an asset, there is a property called “Must be Image”.
If the uploaded image is a webp file, there appears an error because webp seems to be not recognized as image.
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Related issue: The thumbnail generation for webp images does not work. But that is probably also postponed until ImageSharp provides appropriate support: [POSTPONED] Uploaded images should automatically generated and expose an WebP version
I have to close this for now and refer to the feature request. There is no managed support for webp in C# yet.
I have found this one: https://github.com/JosePineiro/WebP-wrapper, but it is just a wrapper and this will be a support hell for me because of all the different deployments.