Ok I will contact them and get back to you.
Meanwhile can you help me with this question?
How can I load a map for the material from URL string? I am using shapediver through CDN ?
so there is an easy solution to this. MapData does not take a link, but an HTMLImageElement as an input. Here is an example where I tried this and it works.
Additionally, here is the documentation.
Is there a specific reason why you use the CDN instead of the NPM package? This issue could have been avoided with the types that are provided with the NPM package.