I have had a number of webp issues on Linux. Support is nowhere near as bad as it was several years ago, but I still have a few programs that don't work with webp.
I would imagine it's a much bigger mess on windows since so many programs will have their own image processing libraries.
In my case, Illustrator and XD, which I use a lot. One of the best features of XD is the ability to drag and drop images into placeholders but I can't do that with webp. In Illustrator, importing a webp file crashes the app.
For a program costing US$22.99/mo crashing and not accepting webp, which is so abundant, is extrem. Especially crashing for such an expensive program is not acceptable.
Last week, I tried to send a picture using QSSTV and it wouldn't open the webp image I saved from a website, so I had to convert it first.
Up until last year, Libreoffice didn't support webp and many Linux distros haven't updated to the version that supports it yet.
Even GIMP and ImageMagick didn't support it for quite a while. Before they supported it, it was almost impossible to do anything with webp.