James
It's possible to generate a glb off of a gltf using webp textures by editing the gltf's mimeTypes to be "image/webp" and to point towards their respective texture.webp image. The...
Also seconding this request, my site has the same issue or a very similar one.
 Here's a screenshot, this is an automatic backup being flagged (this is why the file name has a date in it)